an

英[ən]美[æn]

art.一（在元音字母前代替不定代词a），一任一某一，一个；

英语六级真题

They developed an interest in the origin of modern art forms.

They can multiply at an accelerating rate.

These designers established the modem dress code, letting playsuits and other activewear outfits suffice for casual clothing, allowing pants to enter the wardrobe, and prizing rationalism and versatility in dress, in contradiction to dressing for an occasion or allotment of the day.

The 224 students who make it to the national competition get an all-expenses-paid trip.

Tennessee's technical and community colleges will not outsource ( ' , 外包) management of their facilities to a private company, a decision one leader said was bolstered by an analysis of spending at each campus.

Most Grand Tourists, however, stayed for briefer periods and set out with less scholarly intentions, accompanied by a teacher or guardian, and expected to return home with souvenirs of their travels as well as an understanding of art and architecture formed by exposure to great masterpieces.

Morgan said those findings—which included data from the system's 13 community colleges, 27 technical colleges and six universities—were part of the decision not to move forward with Governor Bill Haslam's proposal to privatize management of state buildings in an effort to save money.

Middle school is an important age because students have enough math capability to solve advanced problems, but they haven't really decided what they want to do with their lives, said Loh.

It's also pushing ahead in 2016 with an expansion of Bluemercury, the beauty chain it bought last year.

It is urgent for governments to increase the cost of using fossil fuels to an appropriate level to lessen the catastrophic effects of climate change.

Interest in elite high school math competitions has grown in recent years, and in light of last summer's U.S. win at the International Math Olympiad ( ' , IMO)—the first for an American team in more than two decades— the trend is likely to continue.

In these groups, which came out of an Eastern European tradition of developing young talent, professors teach promising K-12 students advanced mathematics for several hours after school or on weekends.

In an email statement from the state's Office of Customer Focused Government, which is examining the possibility of outsourcing, spokeswoman Michelle R.

In an email sent Monday to college presidents in the Tennessee Board of Regents system, outgoing Chancellor John Morgan said an internal analysis showed that each campus' spending on facilities management fell well below the industry standards identified by the state.

In an earlier time, American fashion had also followed the dictates of Paris, or even copied and pirated specific French designs.

In England, where architecture was increasingly seen as an aristocratic pursuit, noblemen often applied what they learned from the villas of Palladio in the Veneto and the evocative ( ' , 唤起回忆的) ruins of Rome to their own country houses and gardens.

For example, the United Arab Emirates has endorsed an ambitious target to draw 24% of its primary energy consumption from renewable sources by 2021.

Data on management expenses at the college system and in other state departments will be part of a business justification the state will use as officials deliberate the specifics of an outsourcing plan.

Another influential feeder for advanced-math students is an online school called Art of Problem Solving, which began about 13 years ago and now has 15,000 users.

Agreement on an international carbon-price floor would be a good starting point in that process.

In an era of instant information, shoppers can use their mobile phones to find deals.

With fertilizer prices jumping nearly 50% per metric ton over the last year in some places, human waste is an attractive, and often necessary, alternative.

When we ask teens to choose a hero, they usually select an older family member rather than a remote public figure.

We are very proud of our accomplishments under the Greenlist system and we believe that we will prevail in these cases, Christopher Beard, director of public affairs for SC Johnson, said, while acknowledging that this has been an area that is difficult to navigate.

Unilever recently ran an interactive campaign for its Axe deodorant ( ' , 除臭剂), which kept viewers engaged for more than three minutes on average.

This is an issue of equality, opportunity and national conscience.

They include such measures as accountable care organizations to take charge of a patient's needs with an eye on both cost and quality, and chronic disease management to make sure the seriously ill, who are responsible for the bulk of all health care costs, are treated properly.

There were no longer enough fish in the sea for the stock to maintain itself, let alone an industry.

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 answer is that no one has an easy fix for rising medical costs.

The Senate bill would create an independent commission to monitor the pilot programs and recommend changes in Medicare's payment policies to urge providers to adopt reforms that work.

The Senate Finance bill would impose an excise tax ( ' , 消费税) on health insurance plans that cost more than $8,000 for an individual or $21,000 for a family.

That's an insult to students.

That would be true only if you believed that patients should have an unrestrained right to treatments proven to be inferior.

So the news that Cablevision, an American cable company, was rolling out interactive advertisements to all its customers on October 6th was greeted with some skepticism.

Recently, we examined more than 400 essays on the laws of life that teens from two communities had written as part of an educational program initiated by the John Templeton Foundation in Radnor, Pa.

Perhaps in the face of impersonal and intimidating globalization, a young person's family feels more like a friendly haven than an oppressive trap.

Many even think their parents are cool! Although more than a third have an object in their rooms they would like to keep secret from their parents, rarely is it anything more alarming than a diary or offcolor ( ' , 低俗的) book or CD.

Magna, an advertising agency, reckons it will be worth about $138 million this year.

In the last five years or so, there has been an explosion of green claims and environmental claims.

In other words, structural unemployment is a fake problem, which mainly serves as an excuse for not pursuing real solutions.

If such an indicator exists, it is well hidden.

Get a teacher from the top 20%, and it's as if a child has gone to school for an extra month or two.

For almost five centuries a very large supply of cod ( ' , 鳕 鱼) provided abundant raw material for an industry which at its peak employed about 40,000 people, sustaining entire communities in Newfoundland.

Enrollees would have to pay more money for many services out of their own pockets, and that would encourage them to think twice about whether an expensive or redundant test was worth it.

During commercials, an overlay will appear at the bottom of the screen, prompting viewers to press a button to request a free sample or order a catalogue.

David Mallen, associate director of the Council of Better Business Bureau, said in the last two years the organization had seen an increase in the number of claims companies were bringing against each other for false or misleading environmental product claims.

Cooking is an occasional hobby and a vehicle for celebrity chefs.

But there is also a place in a young life for noble purposes that include a dedication to the broader society, a love of country and an aspiration to make their own leadership contributions.

But Pay Drechsel, an environmental scientist, argues that the social and economic benefits of using untreated human waste to grow food outweigh the health risks.

As I said, structural unemployment isn't a real problem, it's an excuse—a reason not to act on America's problems at a time when action is desperately needed.

Today, my guest is Dana Ivanovich, who has worked for the last twenty years as an interpreter.

The report warnsthe picture on wages is likely to get worse this year despite indications of an economic rebound.

The other thing that people do forget is that these are medicines, so they do have an impact.

Researchers at Duke University scrutinized more than 160 published studies and found an absence of strong evidence that any of these approaches can make a big difference.

Patrick Belser, an International Labour Organization specialist says declining wage rates are linked to the levels of unemployment.

Now Fred, you went to university in Canada?( ' , 9 ) A recent International Labour Organization report says the deterioration of real wages around the world calls into question the true extent of an economic recovery, especially if government rescue packages are phased out too early.

Yong Yu, a Chinese microbiologist, showed off the spacious building, with empty desks under an illustrated timeline detailing the rapid growth of China's Antarctic operations since the 1980s.

While most parents, teachers and clinicians would react to an adolescent using drugs or getting drunk, they may easily overlook teenagers who are engaging in inconspicuous behaviors.

What a waste of money! In return for an average of ~44,000 of debt, students get an average of only 14 hours of lecture and tutorial time a week in Britain.

To call stress an epidemic isn't exaggeration.

These less- stressed workers gained an average of 62 minutes per week of productivity.

These factors have converged to create an increasingly impossible situation with many employees overworking to the point of burnout.

There is an incompatibility in the rate at which these are advancing relative to the way we're digesting it, he said.

Their behaviors can be an invisible threat to society.

The practice of clocking in for an eight-hour workday is a leftover from the days of the Industrial Revolution, as reflected in the then-popular saying, Eight hours labor, eight hours recreation, eight hours rest.

The overwhelming majority of employees attribute their stress mainly to low pay and an excessive workload.

The 83% of American employees who are stressed about their jobs – up from 73% just a year before – say that poor compensation and an unreasonable workload are their number-one sources of stress.

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.

Only 13 percent of respondents said that they were interested in buying a smartwatch in 2016, for example – an increase of just one percent from the previous year despite a year of high-profile launches.

Making sure to obtain an upper-second class degree.

Less than an hour away by snowmobile, Chinese labourers have updated the Great Wall Station, a vital part of China's plan to operate five bases on Antarctica, complete with an indoor badminton court and sleeping quarters for 150 people.

Learning how to take risks in an ever-changing world.

It may have found an ideal way to handle teenagers with behavioral problems.

It is building its second ice-breaking ship and setting up research drilling operations on an ice dome 13,422 feet above sea level that is one of the planet's coldest places.

In-office wellness programs may help reduce stress levels, but they are hardly an ultimate solution to the problem.

In an article published in the journal Science, four scholars say racial categories need to be phased out.

In November 2013, after an unnecessary round of additional consultation, health minister Jane Ellison said the government was minded to proceed after all.

In a study published last year, psychologists coined the term workplace telepressure to describe an employee's urge to immediately respond to emails and engage in obsessive thoughts about returning an email to one's boss, colleagues or clients.

But an array of countries are rushing to assert greater influence here, with an eye not just towards the day those protective treaties expire, but also for the strategic and commercial opportunities that already exist.

Basically the tech industry seems to be in an awkward period now.

As technology ( ' , and with it, work emails) seeps ( ' , 渗入 ) into every aspect of our lives, work-life balance has become an almost meaningless term.

As some countries expand operations in Antarctica, the United States maintains three year-round stations on the continent with more than 1,000 people during the southern hemisphere's summer, including those at the Amundsen-Scott station, built in 1956 at an elevation of 9,301 feet on a plateau at the South Pole.

And while you may forgive your smartphone an occasional fault, you probably have less patience for error messages from your door lock.

And it is hard not to think: Are we in an innovation lull ( ' , 间歇期 )?In some ways, the answer is yes.

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.

An upper-second class degree, from an elite university.

Add a rapidly changing economy and an uncertain future to this 24/7 connectivity, and you've got a recipe for overwork, according to Phyllis Moen.

Small wonder that an Indian legend described Devils Tower as being formed by supernatural powers.

One day, I was invited to an important event, and I wanted to wear something special for it.

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

And the New Yorkers who spent a bundle on an outdoor hot tub now admit they rarely use it, because we can’t afford to heat it in winter.

While that may make suborbital travel safer, it would add significant cost and complexity to an emerging industry that has until now operated largely as the playground of billionaires and dreamy engineers.

When you hear people speaking of making a rapid transition toward any type of energy, whether it is a switch from coal to nuclear power, or a switch from gasoline-powered cars to electric cars, or even a switch from an incandescent to a fluorescent light, understanding energy system inertia and momentum can help you decide whether their plans are feasible.

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.

This is a very sensible way for an animal to make decisions in the wild and would have been very helpful for humans for thousands of years.

There's an old saying in the space world: amateurs talk about technology, professionals talk about insurance.

There is a lot of support at Yale, to an extent, after a while, there is too much support, he said, half-joking about the countless resources available at the school.

The whole fixture must be replaced—light source and luminaire—and this is never an inexpensive proposition.

The notion of space tourism took hold in 2001 with a $20 million flight aboard a Russian spacecraft by Dennis Tito, a millionaire engineer with an adventurous streak.

柯林斯高阶英汉双解学习词典释义

DET

（在发音以元音开始的单词前，代替不定冠词a）

An is used instead of 'a', the indefinite article, in front of words that begin with vowel sounds.

英英词典释义

Noun

1. an associate degree in nursing