could

英[kʊd , kəd]美[kʊd , kəd]

aux.“can”的过去式，能够，打算，用于假设语气的条件句，用于虚拟语气的结论句；

modal verb能，会，可以（can的过去式），可能，本来可以，真想；

英语四级真题

A quantitative- based one, for example, is unlikely to be sent home, where one could ask their older brothers and sisters to help.

A rat or pigeon might not be the obvious choice to tend to someone who is sick, but these creatures have some 26 superior skills that could help the treatment of human diseases.

A simple "thank you" lets the senders know that their email has arrived safely, that it has not been lost among what could be 50 other emails that have arrived in your email inbox that day.

After exercising, the scientists tested the cyclists with eye tracking cameras to see how well their brains could still control their visual system.

After new legislation demanded their removal from the roads, a low interest loan scheme was set up with three Egyptian banks so drivers could buy new cars.

Agents and fashion houses who hire models with a Bmi under 18 could pay $82,000 in fines and spend up to 6 months in jail.

Although the pressure of the cabin is adjusted to prevent altitude sickness, you could still experience sleepiness or a headache.

And men were in jeans, and could wear their hair long too.

And,on top of that, I'd specifically asked if I could leave early last Friday as I'd done a lot of overtime during the week.

Arriving guests could bypass the front desk and go straight to their rooms.

As artificial intelligence A becomes increasingly sophisticated, there are growing concerns that robots could become a threat.

Between now and 2050, the urban population of Africa could triple.

But adding Venice to the UNESCO endangered list—which is dominated by sites in developing and conflict- ridden countries—would be an international embarrassment, and could even hurt Italy's profitable tourism industry.

But global warming has raised the possibility that domestic produce could be seriously affected by rare weather events more often.

But if we come up with an answer, robots could be good for humanity.

But in his lifetime, Careme, ever confident, could see beyond his short domination in the kitchen.

Companies like Intel developed faster microprocessors, so personal computers could process the incoming signals at a more rapid rate.

Companies soon discovered that work could be done at home and submitted online, so a whole new class of telecommuters began to earn a living from home offices unshaven and wearing pajamas (睡衣).

Corporations created home pages where they could place text and graphics to sell products.

Could he help explain her experiences?

Could you reproduce silicon Valley elsewhere, or is there something unique about it?

Dozens of children at a Utah elementary school had their lunch trays snatched away from them before they could take a bite this week.

Each of these stages could potentially be different.

Emailing the neuroscientist and memory researcher jim McGaugh one day, she claimed that she could recall every day of her life since the age of 12.

Even if they could, Simpli Safe claims that its system is always evolving, and that it varies slightly from system to system, which means there wouldn't be a universal magic formula for cracking it.

Every one of them has vulnerabilities that a knowledgeable thief could theoretically exploit.

Fantasy proneness could be considered a tendency to imagine and daydream,whereas absorption is the tendency to allow your mind to become absorbed in an activity – to pay complete attention to the sensations and the experiences.

first of all, could you give me your full name?

For each assignment, I was to write the best essay I could.

For example, consumers could use appliances in a more efficient way by adjusting the time of cooking to the type of food.

Good morning, could I talk to Jeffrey Harding, please?

He could not watch television except for two programs a week, could not play with his friends after school until he finished his homework, and had to read two books a week and write book reports about them.

He said: "My stings are a bit painful but I am pleased it all worked out and I could help."

I can't wait, and if Tom goes, we could go sailing.

I could come the day after, if that suits you.

If all goes well, the company says it could have the feature in all of its hotels by next year.

If I could go back in history and live when I liked, I wouldn't go back very far.

If you could get the right ten thousand people to move from silicon Valley to Buffalo, Buffalo would become Silicon Valley.

In a bid to take production back to Detroit, michigan lawmakers have introduced legislation that could make their state the best place in the country, if not the world, to develop self-driving vehicles and put them on the road.

In a multi-stage life, you could be an undergraduate at 20, 40, or 60; a manager at 30, 50, or 70; and become an independent producer at any age.

In a straightforward sense, he could mean that a critic must be more talented than the artist she critiques.

In any event, my mother and her red pen showed me how deeply flawed a flawless essay could be.

In fact, the camera could be the thing that proves that they didn't steal the $20 dollars, or knock the vase off the table.

In fall 2010, she helped launch a pilot project in Chicago to see if the I Pad could improve working conditions and patient care.

In one the focus could be on building financial success and personal achievement, in another on creating a better work/life balance, still another on exploring and understanding options more fully, or becoming an independent producer, yet another on makin

In the distance, people could see the train rounding a bend headed into the station.

Instead of giving people practice, the gradual reduction likely gave them cravings 瘾 and withdrawal symptoms before they even reached quit day, which could be why fewer people in that group actually made it to that point.

It could also get people out of cities in danger of being bombed.

It could also mean training employees how to do their jobs through video game platforms.

It has been brought on by years of eating anything he could get his hands on.

It was fortunate that the family didn't try to dig up the fossil because that could destroy the specimen; they did the right thing by calling someone who would know what to do.

It was like living in an age you could never have imagined, and that never has come back.

Leah easily could have fallen into a trap of feeling content; instead, her energy sparked a period of experimentation and renewal.

Maybe you could do the same.

More productive farmers meant there was a surplus that could feed cities; in turn, that created a pool of labour for factories.

New research has found deep water reserves under the state which could help solve their drought crisis.

Of course, I had heard that genius could show itself at an early age, so I was only slightly taken aback that I had achieved perfection at the tender age of 14.

One online post said that the raccoon has succeeded in uniting the country the way no politician could.

Or Maybe the reward of a half-sized portion could be a half-sized dessert to be claimed only on a future date.

Phone lines could only transmit information at a limited rate.

Plus, on-campus jobs eliminate commuting time, and could be a great way to connect with academic and professional resources at your university.

Real criticism is not meant to find obvious mistakes, so if she found any — the type I could have found on my own — I had to start from scratch.

Recently it was shown that they could be trained to be as accurate as humans at detecting breast cancer in images.

Robots could also learn values from drawing patterns from large sets of data on human behavior.

She could see their photos and read their status updates.

since industrialization, maintaining such a slow cultural metabolism has been much harder, with the long midday meal shrinking to whatever could be stuffed into a lunch bucket or bought at a food stand.

So while there're plenty of hackers who could start startups, there's no one to invest in them.

So, could you tell me, what's the quickest way to get there?

Soon airline tickets, hotel reservations and even cars and homes could be purchased online.

Such a system could, if necessary, move troops quickly from one area to another.

Suddenly, our market has exploded in size and we could now sell our products all across the continent.

The fact that attitudes toward self-driving cars appear to be so steady across generations suggests how transformative the shift to driverless cars could be.

The findings shed light on normal age-related changes in mental function, which could aid in understanding the process of dementia, according to the researchers.

The one that used to get me was that swans could break your leg with a blow of the wing.

There's no question that self-driving vehicles could be an enormous benefit.

They could be sold, but we want to save them for future years.

They hope to return to the site with geologists for an additional search as there could before fossils near the site.

They say it is healthier than green tea and could be sold for a price that is three to four times higher than the price of green tea.

They sent me an invitation with a note saying I could take a friend for free on the first day.

They were all edited for gender and other identifying information, so Dutt and her team could assign them a score without knowing the gender of the student.

This difference in handling conflict could be the deciding factor on who gets promoted to a leadership position and who does not.

This, in turn, has a major effect on their diet, leading scientists to speculate that the ability to learn population-specific hunting methods could be driving the animals' genetic development.

Thus, rising microwave sales could be seen as a positive thing.

Transitions between stages could be marked with sabbaticals as people find time to rest and recharge their health, re-invest in their relationships, or improve their skills.

Universities posted research data on the Internet, so students could find valuable information without leaving their dormitories.

windows of the red bus were left smashed, and blood could be seen on the ground beside the vehicle.

with Facebook she could keep her relatives up to date on what she was doing.

with Facebook she could stay connected with her family no matter how far away they were.

英语六级真题

A number of pioneers from the technology industry, most famously the entrepreneur Elon Musk, have also expressed their concerns about the damage that a super-intelligent AI could do to humanity.

A slow response to a message could hurt not only your reputation but also your livelihood.

According to a report from the Harvard School of Public Health, many everyday products, including some bug sprays and cleaning fluids, could lead to an increased risk of brain and behavioral disorders in children.

According to Harry Vallentine, a Canadian engineer who is researching modern steam technology, a special tank measuring 2 by 10 metres could store over 750 kilowatt hours of energy as high pressure steam, enough to pull a two-cart train for an hour or so.

According to the survey, that lack of enthusiasm could stem from concerns about privacy and security.

Addressing differences in the earliest years, it seems, could reduce inequality in the next generation.

Although the planned operation will be located more than miles away, drawing the soda ash in through pipelines, conservationists worry it could still upset the natural water cycle and breeding grounds.

And although anxious parents may not welcome the notion, educators could turn adolescent recklessness to academic ends.

And as the distance between their breeding grounds and their food grows, entire colonies could be wiped out.

And even before then, scholars warn, the demand for resources in an energy-hungry world could raise pressure to renegotiate Antarctica's treaties, possibly allowing more commercial endeavours here well before the prohibitions against them expire.

And this finding could have important implications for how we think about educating adolescents.

Any crack in that front could be fatal for tech companies that must operate worldwide.

As it grew more popular, the company sold rights to bottle the soda, so it could travel easily.

As part of the upgrading of its rail yard, Kasselman, who is an inventor and self-proclaimed "steam visionary", is campaigning for a new steam train that runs without any fire and could run on an existing ten- kilometer line, driving tourists and perhaps

As trees outgrow their ideal habitats in the face of climate change, these flying ecosystem engineers could be a big help in replanting trees.

As Vaclav Smil points out, "All the forecasts, plans, and anticipations cited above have failed so miserably because their authors and promoters thought the transitions they hoped to implement would proceed unlike all previous energy transitions, and that

Assumptions about genetic differences between people of different races could be particularly dangerous in a medical setting.

Beyond revealing population-wide patterns, the right combination of data and analysis can also help individuals identify unique characteristics of their own behavior, including conditions that could indicate the need for some form of intervention-such as

Beyond the Antarctic treaties, huge obstacles persist to tapping these resources, like drifting icebergs that could jeopardise offshore platforms.

But along comes a new study that could change that.

But could Norway keep its standard of living and yet cut its emissions to Moroccan or even Ethiopian levels?

But it is another thing to have a supply of trained talent that could let you carry out this promise.

But Steinberg suspected this tendency could also have its advantages.

But telling them that eating lots of high-fiber foods could reduce the risk of breast cancer before middle age, that's a powerful message.

But the only way college could be free is if the faculty and staff donated their time, the buildings required no maintenance, and campuses required no utilities.

By the time we wake up to the threat posed by climate change, it could well be too late.

Could utility alone justify the new ideas of the American designers?

Devils Tower, the first national monument in America, could almost be mistaken for the stump of an enormous tree.

Each week, he would try something different to see if he could find a better, faster way down the mountain.

Efforts like painting eyes on cow butts may seem crazy at first, but they could make actual headway in the fight for conservation.

Essentially, I could not agree more with the authors,"said Svante Pääbo, a biologist and director of the Max Planck Institute for Evolutionary Anthropology in Germany.

Even the children who had above average self-control as pre-schoolers could have benefited from more self-control training.

Exercise, diet, cognitive stimulation showed some positive effects, although the evidence was not so strong that we could actually consider these firmly established.

Experts said that whether or not Apple loses this specific case, measures that it could put into place in the future will almost certainly be able to further limit the government's reach.

For Droujkova, high-level math is important, and what it could use in American classrooms is an injection of childlike wonder.

For instance, a research group here at Arizona State University recently claimed their developmental small CubeSats could cost as little as $3, 000 to put in orbit.

Germany is known for its efficiency and refined engineering, but when it comes to its new ghost airport, this reputation could not be further from the truth.

Having to install a different app for each smart appliance in your home is annoying; it would be nicer if you could manage everything together.

He says that more openness in science could help to discourage what some perceive as a common practice of shutting out early-career scientists requests for data.

history and English could be presented through the lens of the psychological drives of the people involved.

I could easily escape discomfort, temporarily, by answering email or browsing the web under the pretense of so-called research.

I could see there was a lot of talent there and some great potential, particularly in their product development.

I don't think we know exactly what's going to happen but it's certainly possible that we could get very slow growth over the next year or two.

I feel like I could stay by myself until I'm 100.

I guess you could call it a liquid salad.

I was hoping I could have a moment of your time if you're not too busy.

I wish I could buy more organic produce from here, but I find the kids don't like it.

If private plans demanded similar productivity savings from providers, and refused to let providers shift additional costs to them, the savings could be much larger.

If the method works, it could provide farmers in Botswana-and elsewhere with a low-cost, sustainable tool to protect their livestock, and a way to keep lions safe from being killed.

If the method works, it could provide farmers in Botswana-and elsewhere -with a low-cost, sustainable tool to protect their livestock, and a way to keep lions safe from being killed.

I'm having some problems getting started on my dissertation and I was hoping you could give me some advice on how to begin.

In 2001, for example, the Environmental Protection Agenc restricted the type and amount of lead that could be present in paint and soil to homes and child-care facilities after concerns were raised about lead poisoning.

In 2012, Kaggle challenged its community to build a program that could grade high school essays.

In any case, if I could do it again, I'd still make the same choice.

In fact, cost sharing could be a very practical solution, especially in times of financial difficulty.

In many cases, you could stand at the edge one village and see the outskirts of the next community.

In practical terms, the new guidelines being develop could result in doctors choosing one drug over another for cost reasons or even deciding that a particular treatment — at the end of life, for example — is too expensive.

In short, success in creating AI could be the biggest event in the history of our civilisation.

It could also insist on checking private manned spacecraft as thoroughly as it does commercial aircraft.

It could just be a waste of money.

It is still easy to be dazzled by the display of drones, 3D printers, virtual reality goggles and more "smart" devices than you could ever hope to catalog.

It ties up cash we could put to better use elsewhere.

It’s the mother of all disaster drills for what could be the worst disaster in American history.

Joseph says his products are priced 10-20% above organic versions, but depending on the product chosen, compared to non-organic conventional yogurt, consumers could pay a premium of 30-50% or more for grass-fed.

Less inherently interpersonal subjects, such as math, could acquire a social aspect through team problem solving and peer tutoring.

Maybe you could gather capital from other sources, smaller loans from more lenders?

Medicare could save hundreds of millions of dollars a year if everyone used the cheaper drug, Avastin, instead of the costlier one, Lucentis.

migrating birds affect ecosystems both at home and at their winter destinations, and disrupting the traditional routes could have unexpected side effects.

Multiples can be deployed in combination for more complex missions than could be achieved by one CubeSat alone.

No, and he was away before I could get hold of the letter.

Notwithstanding important recent progress in developing renewable fuel sources, low fossil fuel prices could discourage further innovation in, and adoption of, cleaner energy technologies.

Once armed with a method for gaining access to iPhones, the government could ask to use it proactively, before a suspected terrorist attack—leaving Apple in a bind as to whether to comply or risk an attack and suffer a public-relations nightmare.

One could therefore present Napoleon in terms of his desire to impress or Churchill in terms of his lonely gloom.

Operationally, you could think intimacy as you share secrets: you share information with this person that you don't share with anybody else.

Over the next few months, I realized not only could I not afford my dream school, I couldn't even afford the ones where I'd been accepted.

People could see it was the best way to work.

Professor Henderson, could you give us a brief overview of what you do, where you work and your main area of research?

Progress in the development of renewables could be fragile, however, if fossil fuel prices remain low for long.

rising temperatures and overfishing in the pristine waters around the Antarctic could see king penguin populations pushed to the brink of extinction by the end of the century, according to a new study.

Sainz Breeze insist that such food is no joke and could be a new, sustainable source of protein.

Saying that there're no easy answers sounds wise, but it's actually foolish: our unemployment crisis could be cured very quickly if we had the intellectual clarity and political will to act.

She stayed in the Northwest, although the test could not be more specific than somewhere between eastern Oregon and western Wyoming.

So how could you ever become a movie star?

So the researchers looked at time spent in a number of activities that could plausibly be driving the well-being decline.

So there could be less protein, more sugar and some additives you wouldn't expect, such as caffeine.

So what other variables could be used if the racial concept is thrown out?

Some "expert amateurs" in the satellite game could provide some inspiration for how to proceed responsibly.

Television advertising could do with a boost.

That means that the FAA could suspend virgin Galactic's licence to fly.

That way, Apple could not unilaterally introduce a code that weakens the iPhone—a user would have to consent to it.

The bills in both chambers would create health insurance exchanges on which small businesses and individuals could choose from an array of private plans and possibly a public option.

The bureau could easily present their data in more useful ways, but they have chosen not to.

The consumer was ultimately to be mentioned as well, especially by the likes of Dorothy Shaver, who could point to the sales figures at Lord&Taylor.

The expert review also found insufficient evidence to recommend any drugs or dietary supplements that could prevent or slow cognitive decline.

The finding points to longstanding evidence that fiber may reduce circulating female hormone levels, which could explain the reduced risk.

The last time a major earthquake occurred along the Cascadia fault was in 1700, so officials worry that another event could occur any time.

The market for products designed specifically for older adults could reach $30 billion by next year, and startups want in on the action.

The materials from e-waste include iron, copper gold, silver, and aluminum—materials that could be reused, resold, salvaged, or recycled.

The most common CubeSat is a 10cm cube, so small that a single CubeSat could easily be mistaken for a paperweight on your desk.

The order essentially asks Apple to hack its own devices, and once it is in place, the precedent could be used to justify law enforcement efforts to get around encryption technologies in other investigations far removed from national security threats.

柯林斯高阶英汉双解学习词典释义

MODAL

能;会

You use could to indicate that someone had the ability to do something. You use could not or couldn't to say that someone was unable to do something.

例句

MODAL

可能会;有时会

You use could to indicate that something sometimes happened.

例句

MODAL

本能够，本可以(表示某事本有可能发生但却并未发生)

You use could have to indicate that something was a possibility in the past, although it did not actually happen.

例句

MODAL

(表示某事可能属实或可能发生)可能

You use could to indicate that something is possibly true, or that it may possibly happen.

例句

MODAL

(表示某事不属实)不可能

You use could not or couldn't to indicate that it is not possible that something is true.

例句

MODAL

(表示可能性、能力或机会)可能

You use could to talk about a possibility, ability, or opportunity that depends on other conditions.

例句

MODAL

好像；仿佛

You use could when you are saying that one thing or situation resembles another.

例句

MODAL

(表示提议或建议)可以

You use could, or couldn't in questions, when you are making offers and suggestions.

例句

MODAL

(用于礼貌地提出请求或征得许可。当说话者意识到可能被拒绝时，可以用 couldn't 代替 could)能，可以

You use could in questions when you are making a polite request or asking for permission to do something. Speakers sometimes use couldn't instead of 'could' to show that they realize that their request may be refused.

例句

MODAL

(用以礼貌地打断某人或引出将要说的话)请允许我

People sometimes use structures with if I could or could I as polite ways of interrupting someone or of introducing what they are going to say next.

例句

MODAL

(用以强调某人应该做所提及的事情，尤用于当说话者因为其没做该事而生气时)

You use could to say emphatically that someone ought to do the thing mentioned, especially when you are annoyed because they have not done it. You use why couldn't in questions to express your surprise or annoyance that someone has not done something.

例句

MODAL

(表示想要做某事的强烈感情)

You use could when you are expressing strong feelings about something by saying that you feel as if you want to do the thing mentioned, although you do not do it.

例句

MODAL

(用在if后以谈论没有能力或机会做但为考虑可能的结果而设想去做的事)

You use could after 'if' when talking about something that you do not have the ability or opportunity to do, but which you are imagining in order to consider what the likely consequences might be.

例句

MODAL

(与比较级连用，强调某物或某人具备某种特征的程度)太…，再…不过

You use could not or couldn't with comparatives to emphasize that someone or something has as much as is possible of a particular quality. For example, if you say 'I couldn't be happier', you mean that you are extremely happy.

例句

MODAL

怎么会(用在疑问句中强调对所发生的不愉快之事的感受)

In speech, you use how could in questions to emphasize that you feel strongly about something bad that has happened.

例句

CONVENTION

不用了(谢绝更多的食物或饮品)

You say 'I couldn't' to refuse an offer of more food or drink.

例句

英汉词典释义

_no_

(表示结果)

(表示建议)

aux.

(表示允准)（询问是否可做某事）能, 可以

(表示请求)（礼貌地请求别人做事）能, 可以

(表示可能性), 可能

（强调感觉）真想

（对某人未做某事表示恼怒）本来可以

(表示建议) 可以

（用于 can 的过去时）