once

英[wʌns]美[wʌns]

adv.一次，每一次，每隔…一次，曾经；

conj. 一…就；

英语六级真题

The British traveler Charles Thompson spoke for many Grand Tourists when in 1744 he described himself as being impatiently desirous of viewing a country so famous in history, a country which once gave laws to the world, and which is at present the greatest school of music and painting, contains the noblest productions of sculpture and architecture, and is filled with cabinets of rarities, and collections of all kinds of historical relics.

The elevation of the room that once belonged only to the servants to that of design showcase for the modem family tells the story of a century of social change.

That falls far short of the billions of dollars people once expected it to generate.

Parents are concerned that their children may get involved in criminal offences once they reach their teens.

No wonder parents worry their own kids might spin out of control once they hit the turbulent waters of adolescence.

It had, apparently, been fished out of existence; and the once mighty Newfoundland fleet now gropes about frantically for crab on the sea floor.

About once a week, I have a client that will bring up a new certification I've never even heard of and I'm in this industry, said Kevin Wilhelm, chief executive officer of Sustainable Business Consulting.

Putting in effect the policies in the agreement at once.

Perlow calls this vicious cycle the cycle of responsiveness: Once bosses and colleagues experience an employee's increased responsiveness, they increase their demands on the employee's time.

Consumers are becoming increasingly bored with what companies have to offer: A survey of 28,000 consumers in 28 countries released by Accenture found consumers are not as excited about technology as they once were.

Stacy is going to walk you through the step-by-step process of becoming a social worker and Mill will tell you about the range of options you have once you get your social work degree, as well as the high standards of responsibility the social workers must adhere to.

that is, once you build it up, it has to go somewhere.

Unfortunately for them ( ' , and often the taxpayers), our energy systems are a bit like an aircraft carrier: they are unbelievably expensive, they are built to last for a very long time, they have a huge amount of inertia ( ' , meaning it takes a lot of energy to set them moving), and they have a lot of momentum once they are set in motion.

So a heavy object, like a football player moving at a high speed, has a lot of momentum — that is, once be is moving, it is hard to change his state of motion.

Once you have started the boulder rolling, it develops momentum, which is defined by its mass and velocity.

Now, she attributes much of her understanding of college to that: But once I got to campus, it was a completely different ball game that no one really prepared me for.

By sanctioning this watered-down version of college, universities are catering to the social and educational needs of wealthy students at the expense of others who won't enjoy the financial backing or social connections of richer students once they graduate.

"About once a week, I have a client that will bring up a new certification I've never even heard of and I'm in this industry," said Kevin wilhelm, chief executive officer of Sustainable Business Consulting.

"Once we scale up, algorithms must be sensitive to tiny changes in identities and at the same time invariant to lighting, pose, age," Kemelmacher-Shlizerman said.

As marketing professors Silvia Bellezza, Neeru Paharia, and Anat Keinan recently explained in Hazard Business Review HBR, leisure time was once seen as an indicator of high social status, something attainable only for those at the top.

But once that money is gone, he says he doesn't know what he'll do.

But once these plants use up their stored reserve or tap out the underground supply, they cease growing and start to die.

By sanctioning this watered-down version of college, universities are "catering to the social and educational needs of wealthy students at the expense of others " who won't enjoy the financial backing or social connections of richer students once they gra

Consumers are becoming increasingly bored with what companies have to offer: A survey of 28,000 consumers in 28 countries released by Accenture found consumers are not as excited about technology as they once were.

Driving once seemed to be a very human skill.

Each featuring a different researcher, one of whom they'd met once two years earlier.

first, keeping up with the pace of technological change; recruiting high-quality staff in a time of skills shortages in it as a whole and in a highly competitive market; and the issue of retaining staff once they've been recruited and trained.

Here, the brightly colored scenes that once decorated a mansion are being dug up.

If an adverse reaction to a drug is serious, consult your doctor for advice at once.

Momentum is said to be "conserved", that is, once you build it up, it has to go somewhere.

Native plants are coming back, and the fox once again bound about carefree.

Now, she attributes much of her understanding of college to that: "But once I got to campus, it was a completely different ball game that no one really prepared me for."

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.

Once every three or four years, when conditions are right, the lake is covered with the pink birds as they stop flight to breed.

Once Farrant and her colleagues feel they have a better sense of which switches to throw, they will have to find the best way to do so in useful crops.

Once one person looks at their phone, other people feel compelled to do the same, starting a chain reaction.

Once purchased and trained, this would allow the casual user to save money and time, freeing up precious space in our busy lives to read a good book.

Once the data and associated materials appear in a repository answering questions and handling complaints can take many hours.

Once the final charts and tables are ready, I have to check them and organize a presentation.

Once the interviewers have been briefed, I send the client a schedule and then they get back to me with deadlines.

Once upon a time, Americans thought that if they work hard enough even in the face of adversity, they would be rewarded with success.

Once we recognize that these things happen to us, we are half way to doing something about them.

Once you get out of there, you become that part, only you're using music instead of dialogue.

Online security cameras, intelligent lighting and a wealth of sensors that control both temperature and air quality are offering an unprecedented level of control, efficiency, and improvements to what were once classed necessary costs when running a busin

Perlow calls this vicious cycle the "cycle of responsiveness": Once bosses and colleagues experience an employee's increased responsiveness, they increase their demands on the employee's time.

Photography was once an expensive, laborious ordeal reserved for life's greatest milestones.

piaget argued that once adolescents enter the world of work, their newly acquired ability to form hypotheses allows them to create representations that are too ideal.

So a heavy object, like a football player moving at a high speed, has a lot of momentum — that is, once he is moving, it is hard to change his state of motion.

Stacy is going to walk you through the step-by-step process of becoming a social worker and mill will tell you about the range of options you have once you get your social work degree, as well as the high standards of responsibility the social workers mus

The best seek to alleviate the external pressures on their pupils while equipping them better to understand and handle the world outside一 at once sheltering them and broadening their horizons.

The elevation of the room that once belonged only to the servants to that of design showcase for the modern family tells the story of a century of social change.

The extreme isolation of these massive farms leaves them often unattended, and monitored only once or twice a year, which means if the livestock falls ill or requires assistance, it can be a long time for farmers to discover.

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.

The Tanzanian government has once again started mining the lake for soda ash, used for making chemicals, glass and detergents.

They help us take in more information, hold several ideas in mind at once and understand how different ideas relate to each other.

They typically appear about once in a decade.

Unfortunately for them and often the taxpayers, our energy systems are a bit like an aircraft carrier : they are unbelievably expensive, they are built to last for a very long time, they have a huge amount of inertia meaning it takes a lot of energy to se

When I re-entered the full-time workforce a few years ago after a decade of solitary self-employment, there was one thing I was looking forward to the most: the opportunity to have work friends once again.

Yet once they start growing, such plants seem not to retain the ability to hit the pause button on metabolism in their stems or leaves.

You may have heard that Coca-Cola once contained an ingredient capable of sparking particular devotion in consumers: cocaine.

柯林斯高阶英汉双解学习词典释义

ADV

一次；一回

If something happens once, it happens one time only.

例句

ADV

（与后接day, week, month等的a连用）（每…）一次，（每…）一回

You use once with 'a' and words like 'day', 'week', and 'month' to indicate that something happens regularly, one time in each day, week, or month.

例句

ADV

（与后接day, week, year等的every连用）（每隔…）一次，（每隔…）一回

You use once with 'every' and words like 'day', 'week', and 'year' to indicate that something happens a specified number of times and on a regular basis.

例句

ADV

曾经，一度（状况如此）

If something was once true, it was true at some time in the past, but is no longer true.

例句

ADV

曾经（做过某事）

If someone once did something, they did it at some time in the past.

例句

CONJ-SUBORD

一旦…（就…); 一…（就…）

If something happens once another thing has happened, it happens immediately afterwards.

例句

PHRASE

突然；忽然

If something happens all at once, it happens suddenly, often when you are not expecting it to happen.

例句

PHRASE

立即；马上

If you do something at once, you do it immediately.

例句

PHRASE

同时；一起

If a number of different things happen at once or all at once, they all happen at the same time.

例句

PHRASE

就此一次；破例一次

For once is used to emphasize that something happens on this particular occasion, especially if it has never happened before, and may never happen again.

例句

PHRASE

又一次；再次

If something happens once again or once more, it happens again.

例句

PHRASE

彻底地；一劳永逸地

If something happens once and for all, it happens completely or finally.

例句

PHRASE

偶尔；间或

If something happens once in a while, it happens sometimes, but not very often.

例句

PHRASE

一两次；几次

If you have done something once or twice, you have done it a few times, but not very often.

例句

PHRASE

（常用于儿童故事的开头）从前，很久以前

Once upon a time is used to indicate that something happened or existed a long time ago or in an imaginary world. It is often used at the beginning of children's stories.

例句

英汉词典释义

adv.

一次

曾经, 昔时

（用于否定句、疑问句和 if 后）曾，根本

一度

conj.

一旦…就…

n.

〈口〉一次, 一回

英英词典释义

Adjective

1. belonging to some prior time;

Adverb

1. on one occasion;

2. as soon as;

3. at a previous time;

行业词典

土木工程： 直流冷却水系统；once-through cooling water system；直流水系统；once-through water system；

电力： 抛弃法烟气脱硫；once-through FGD process；直流锅炉；once-through boiler；