but

but

英[bət , bʌt]美[bət , bʌt]

conj.但是，然而，只有；

prep.除了；

adv.只有，仅仅；

n.借口，推辞；

复数：buts;

英语六级真题

These math circles cost nothing, or they're very cheap for students to get involved in, but you have to know about them, said Rusczyk.

The company had previously announced the planned closures, but had not said which locations would be affected.

The Math Video Challenge is a competition, but a collaborative one.

Some intensive summer programs are very expensive but most of them provide scholarships.

Schools or teachers who sign up for the National Math Club receive a kit full of activities and resources, but there's no special teacher training and no competition attached.

Most people would love to get students from more underserved populations, but they just can't get them in the door.

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.

Landfill sites on the Iberian Peninsula have long attracted local white storks, but all of the Spanish birds tagged in the study flew across the Sahara Desert to the western Sahel.

In order to maximize global welfare, every country's carbon pricing should reflect not only the purely domestic damage from emissions, but also the damage to foreign countries.

If you look at a lot of low-income communities in the United States, there are programs that are serving them, but they're primarily centered around ‘Let's get these kids' grades up,' and not around ‘Let's get these kids access to the same kinds of opportunities as more-affluent kids,' said Daniel Zaharopol, the founder and executive director of the program.

Direct subsidies to research and development have been adopted by some governments but are a poor substitute for a carbon price: they do only part of the job, leaving in place market incentives to over-use fossil fuels and thereby add to the stock of atmospheric greenhouse gases without regard to the collateral ( ' , 附带的) costs.

Children grow up learning the skills to succeed in their socioeconomic stratum（ 阶层） but not necessarily others.

But will such contests, which are overwhelmingly dominated by Asian and white students from middle-class and affluent families become any more diverse? Many social and cultural factors play roles in determining which promising students get on the path toward international math recognition.

But there are initiatives in place to try to get more underrepresented students involved in accelerated math.

But the barriers are disappearing, in part because journals and funding agencies worldwide are encouraging scientists to make their data public.

But that's not the only uncertainty.

But renewable energy will have to displace fossil fuels to a much greater extent in the future to avoid unacceptable climate risks.

But efforts are in place to expose more black, Hispanic, and low-income students to advanced math, in the hope that the demographic pool of high-level contenders will eventually begin to shift and become less exclusive.

But 50% of poor parents say it is extremely important to them that their children earn a college degree, compared with 39% of wealthier parents.

A number of factors are driving down the global oil prices not just for now but in the foreseeable future.

Sweden was the first European country to print and use paper money, but it may soon do away with physical currencies.

It concerns not only us sociologists, but also economists, politicians and business people.

We, of course, need to pay attention to youngsters who are filled with discontent and hostility, but we should not allow these extreme cases to distort our view of most young people.

They seem to be turning inward—generally in a pro-social manner, certainly with positive benefits for intimate relationships, but too often at the expense of a connection with the present and future world beyond, including the society they will one day inherit.

There's work to be done, but workers aren't ready to do it—they're in the wrong places, or they have the wrong skills.

The final legislation might throw a public plan into the competition, but thanks to the fierce opposition of the insurance industry and Republican critics, it might not save much money.

The central figures in the Chicago schools strike are neither strikers nor managers but 350,000 children.

The average Norwegian is better off than the average US citizen, but contributes about half as much to climate change.

The Millennium Ecosystem Assessment, a vast four-year global study which reported its initial conclusions earlier this year, found reasons to believe that managing ecosystems sustainably—working with nature rather than against it—might be less profitable in the short term, but certainly brings long-term rewards.

That statement comes not, as you might imagine, from a stereotypical tree-hugging, save-the-world greenie ( ' , 环保主义者), but from Gordon Brown, a politician with a reputation for rigour, thoroughness and above all, caution.

Teaching is so important that it should be like other professions, with high pay and good working conditions but few job protections for bottom performers.

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.

It's true that the main reason inner-city schools do poorly isn't teachers' unions, but poverty.

It's not just about education, but about poverty and justice.

In other words, poor and rich both over-exploit the natural world, but for different reasons.

If our economies are to flourish, if global poverty is to be eliminated and if the well-being of the world's people enhanced—not just in this generation but in succeeding generations—we must make sure we take care of the natural environment and resources on which our economic activity depends.

Clickthrough rates have been high so far ( ' , around 3-4%, compared with less than 0.3% online), but that may be a result of the novelty.

But, instead, the Chicago union seems to be using its political capital primarily to protect weak performers.

But while the number of advertisements may have dipped, there has been a rapid spread of eco-labeling.

But we also found little interest in civic life beyond the tight circles of their family and immediate friends.

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 there are also many examples of growing wealth by trashing the environment, in rich and poor parts of the world alike, whether through unregulated mineral extraction, drastic water use for agriculture, slash-and-burn farming, or fossil-fuel-guzzling ( ' , 大量消耗) transport.

But the data is exact enough for a clear trend to be easily discernible.

But researchers are improving systems to measure a teacher's performance throughout the year, and, with three years of data, it's usually possible to tell which teachers are failing.

But overall, we suspect that spending would come down through elimination of a lot of unnecessary or even dangerous tests and treatments.

But now, as then, powerful forces are ideologically opposed to the whole idea of government action on a sufficient scale to jump-start the economy.

But missing from all these data is the sense that today's young care very much about their country, about the broader civic and political environment, or about the future of their society.

But is this right? Do things get better or worse as we get richer? Here the Stockholm declaration is ambiguous.

But frequently untreated human waste harvested from lavatories is delivered to farms and spread as fertilizer.

But finding hard evidence to support the thesis is not so easy.

But don't bother asking for evidence that justifies this bleak view.

But could Norway keep its standard of living and yet cut its emissions to Moroccan or even Ethiopian levels? That question, repeated across a dozen environmental issues and across our diverse planet, is what will ultimately determine whether the human race is living beyond its ecological means as it pursues economic revival.

But as the working classes prospered and the servant shortage set in, housekeeping became a matter of interest to the educated classes.

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.

But DirecTV, Comcast and Time Warner Cable have all invested in it.

You know, one of the first things I like to tell people when they ask me about the supplements, is that a lot of them are promoted as a cure for your memory, but your memory doesn’t need a cure.

We need more funding and more effort to return these languages to everyday use, says Fred Nowuski of the National Museum of the American Indian, We are making progress but money needs to be spent on revitalising languages, not just documenting them.

But the president may be giving the financial sector too much credit.

But now Israeli researchers are reporting that even sleeping in the same room can have negative consequences: not for the child,but for the mother.

What happens to the centralized electric grid, which took decades and billions of dollars to build, as more and more people become prosumers, who produce and consume their own energy on-site?No one knows which – if any – battery technology will ultimately dominate, but one thing remains clear: The future of energy is in how we store it.

We've held on to this workday structure – but thanks to our digital devices, many employees never really clock out.

This might not be right, but school-leavers who fail to acknowledge as much risk making the wrong decision about going to university.

The wireless age is expanding to include not just our phones, tablets, and laptops, but also our cars, homes, and even whole communities.

The problem isn't the technology itself, but that the technology is being used to create more flexibility for the employer rather than the employee.

The government has moved reluctantly into a sensible public health policy, but with such obvious over- cautiousness that any political credit due belongs to the opposition.

The goal of keeping global temperature rise well below 2 ℃ is commendable but the emissions-reduction pledges submitted by countries leading up to the Paris talks are very unlikely to deliver on this.

The researchers also acknowledged that there are a few areas where race as a construct might still be useful in scientific research: as a political and social, but not biological, variable.

Schoololeavers may moan, but they have little choice but to embrace university and the student debt that comes with it.

Michael Yudell, a professor of public health at Drexel University in Philadelphia, said that modern genetics research is operating in a paradox: on the one hand, race is understood to be a useful tool to illuminate human genetic diversity, but on the other hand, race is also understood to be a poorly defined marker of that diversity.

It's not only unsustainable for workers, but also for the companies that employ them.

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

Companies are pushing it hard but make it almost overwhelming even to dip a toe in the water for the average consumer, because there are so many compatibility issues to think about.

Chinese officials say the expansion in Antarctica prioritises scientific research, but they also acknowledge that concerns about resource security influence their moves.

But this third group was not only unexpected, it was so distinct and so large—nearly one third of our sample—that it became a key finding of the study.

But the study warns that it is teenagers who engage in all three of these practices in the extreme who are truly in jeopardy.

But the plan was suspended in July 2013.

But the invisible group wasn't far behind the high-risk set, with more than 13% of them exhibiting depression.

But that isn't why the government—under pressure from cancer charities, health workers and the Labour party—has agreed to legislate for standardised packaging.

But strength of will is the missing ingredient where Mr.

But over the last couple of years, and in this one in particular, we are starting to see companies shift from what is the largest screen size, the smallest form factor or the shiniest object and more into what all of these devices do that is practical in a consumer's life.

But now these segments are looking at slower growth curves – or shrinking markets in some cases – as consumers are not as eager to spend money on new gadgets.

But even when employees are given paid time off, workplace norms and expectations that pressure them to overwork often prevent them from taking it.

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.

But advances in technology might make Antarctica a lot more accessible three decades from now.

But US researchers quietly complain about budget restraints and having far fewer icebreakers than Russia, limiting the reach of the United States in Antarctica.

But Sadoway isn't alone in trumpeting energy storage as a missing link to a cleaner, more efficient, and more equitable energy future.

But a new study finds that there's another group of adolescents who are in nearly as much danger of experiencing the same psychiatric symptoms: teens who use tons of media, don't get enough sleep and have a sedentary ( ' , 不爱活动的 ) lifestyle.

Brazil opened a research station in 1984, but it was largely destroyed by a fire that killed two members of the navy in 2012, the same year that a diesel-laden Brazilian barge sank near the base.

Annual fees have risen from ￡1,000 to ￡9,000 in the last decade, but contact time at university has barely risen at all.

Today, I’d like to talk about what happens when celebrity role models get behind healthyhabits, but at the same time promote junk food.

People who live, hunt or fish near bird coloniesneed to be careful, the researchers say, The birds don’t mean to cause harm, but the chemicals they carry can cause major problems.

I’m going to define what love is, but then most of the experiments I’m going to talk about are really focused more on attraction than love.

It’s no surprise that high-profile athletes can influence children’s eating behaviors, but the scientists were able to quantify how prevalent these endorsements are in the children’s environment.

I looked through my suitcase but couldn’t find anything to wear.

But those two beverages aren’t the same.

But by 2014, the death rate from Alzheimer’s Disease for this age group have more than doubled, increasing from 3.8% to 8.5%, making the progressive brain disease the second leading cause of death for centenarians.

But because this population is getting larger, the number of deaths in this group is also increasing.

And I’m going to pick a definition from a former colleague, Robert Sternberg, who is now the dean at Tufts University, but was here on our faculty at Yale for nearly 30 years.

There should be forces in society who should be concerned about the budget, but they shouldn't be functioning simultaneously as doctors, said Dr.

The shift, little noticed outside the medical establishment but already controversial inside it, suggests that doctors are starting to redefine their roles, from being concerned exclusively about individual patients to exerting influence on how healthcare dollars are spent.

柯林斯高阶英汉双解学习词典释义

CONJ-COORD

可是；但是；然而

You use but to introduce something which contrasts with what you have just said, or to introduce something which adds to what you have just said.

例句

CONJ-COORD

但是；不过

You use but when you are about to add something further in a discussion or to change the subject.

例句

CONJ-COORD

（用于表示歉意）但是

You use but after you have made an excuse or apologized for what you are just about to say.

例句

CONJ-COORD

（引出下文，表示惊讶、难以置信、拒绝或抗议）但是，可是

You use but to introduce a reply to someone when you want to indicate surprise, disbelief, refusal, or protest.

例句

PREP

除了

But is used to mean 'except'.

例句

ADV

仅仅;只;才

But is used to mean 'only'.

例句

N-PLURAL

借口；托词

You use buts in expressions like 'no buts' and 'ifs and buts' to refer to reasons someone gives for not doing something, especially when you do not think that they are good reasons.

例句

PHRASE

不得不；非…不可；必然

You use cannot but ,could not but, and cannot help but when you want to emphasize that you believe something must be true and that there is no possibility of anything else being the case.

例句

PHRASE

倘没有；要不是

You use but for to introduce the only factor that causes a particular thing not to happen or not to be completely true.

例句

PHRASE

（表示与前面说过的话略有矛盾）不过，然而

You use but then or but then again before a remark which slightly contradicts what you have just said.

例句

PHRASE

（表示前述事情并不奇怪）不过，但是

You use but then before a remark which suggests that what you have just said should not be regarded as surprising.

例句

英汉词典释义

conj.

但是, 然而

而是

除了, 除去

相当于that(用于否定结构后)

(用于加强语气)

(用于表示惊奇或其他强烈感受)

只因为, 可是只有

假如没有…, 要不是

prep.

[常用于 nobody,no one,all, who 等词后面]除…以外,除…外,除了

adv.

只, 仅仅

不过，只不过

只是，刚才，方才

另一方面；还，尚，仍然[用来引导一个句子]

n.

借口；推辞

但是，反对，限制(用于表示反对，= buts)

pron.

[关系代词,意义相当于 who…not; which…not]

vt.

对…说“但是”

英英词典释义

Adverb

1. and nothing more;