The challenge is if certain types of people are doing something, it's difficult for other people to break into it, said Po-Shen Loh, the head coach of last year's winning U.S.Math Olympiad team.
出自-2017年6月阅读原文
Historically, scientists have objected to sharing for many reasons: it is a lot of work; until recently, good databases did not exist; grant funders were not pushing for sharing; it has been difficult to agree on standards for formatting data; and there is no agreed way to assign credit for data.
出自-2017年6月阅读原文
2% in November and December at stores open more than a year, a disappointing holiday season performance that capped a difficult year for a department store chain facing wideranging challenges.
出自-2017年6月阅读原文
In the past, health experts warned us that the day would come in which it would become very difficult to provide medical care for even common problems such as lung infection or severe sour throat.
出自-2017年6月听力原文
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.
出自-2016年6月阅读原文
Mr.Wilhelm said the excess of labels made it difficult for businesses and consumers to know which labels they should pay attention to.
出自-2016年6月阅读原文
It is difficult to find solid evidence to prove environmental friendliness generates more profits than exploiting the natural environment.
出自-2016年6月阅读原文
Whatever your talents, it is extraordinarily difficult to get a leading job in most fields without having been to university.
出自-2016年12月阅读原文
Many large institutions keep this kind of data secret—or at least make it incredibly difficult to find.
出自-2015年12月阅读原文
It is actually quite difficult to find reliable statistics on the issue for many schools.
出自-2015年12月阅读原文
Jack White, the former front man of the White Stripes and an influential figure among fellow musicians, likes to make things difficult for himself.
出自-2013年12月阅读原文
Why would anyone make their work more difficult than it already is
出自-2013年12月阅读原文
The internet makes information billionaires out of all of us, and the architects of our online experiences are catching on to the need to make things creatively difficult
出自-2013年12月阅读原文
It should be difficult enough but still within their reach
出自-2013年12月阅读原文
That makes finding a solution all the more difficult.
出自-2013年6月阅读原文
We will find it difficult to meet our deadlines.
出自-2012年12月阅读原文
Expanding the three-year option may be difficult, but it may be less difficult than asking Congress for additional financial help, asking legislators for more state support, or asking students even higher tuition payments.
出自-2012年6月阅读原文
For many, it's surprisingly difficult.
出自-2011年6月阅读原文
they are generally difficult to manage
出自-2010年12月阅读原文
It's difficult to estimate the number of youngsters involved in home schooling where children are not sent to school and receive their formal education from one or both parents.
出自-2013年12月听力原文
Even so, publication was difficult
出自-2013年12月听力原文
It is a disease very difficult to diagnose.
出自-2013年12月听力原文
The man is capable of dealing with difficult people.
出自-2013年6月听力原文
But the requirements of either of the Acts may be difficult to meet.
出自-2012年12月听力原文
Their requirements may be difficult to meet
出自-2012年12月听力原文
And unemployed workers face difficult odds.
2016年6月六级真题(第一套)听力 Section C
But others opted to lie, and they showed increased activity in their frontal parietal (颅腔壁的) control network, which is involved in difficult or complex thinking.
2019年12月六级真题(第一套)阅读 Section C
Collaboration certainly makes your individual competencies and contributions more difficult for outsiders to identify.
2019年12月六级真题(第一套)听力 Section C
Google and Apple have made it far too difficult to adjust these settings so it's up to us to take steps to ensure we set these triggers to suit our own needs, not the needs of the app makers.
2017年12月六级真题(第一套)阅读 Section B
historically, scientists have objected to sharing for many reasons: It is a lot of work; until recently, good databases did not exist; grant funders were not pushing for sharing; It has been difficult to agree on standards for formatting data; and there i
2017年6月六级真题(第一套)阅读 Section C
However, it is farmers that are pushing for the advancements due to ever-increasing labor vacancies, making it difficult to maintain large-scale operations.
2018年12月六级真题(第三套)阅读 Section C
I'm certain of it, absolutely, especially if it's difficult for a competitor to copy.
2016年6月六级真题(第一套)听力 Section A
In some cases, says data scientist Karthik Ram, it may be difficult for junior researchers to embrace openness when senior colleagues—many of whom head selection and promotion committees—might ridicule what they may view as misplaced energies.
2017年12月六级真题(第二套)阅读 Section B
It used to be difficult to get Spanish produce here, but it’s now a lot more common.
2018年6月六级真题(第二套)听力 Section A
Macy's reported its sales plunged 5.2% in November and December at stores open more than a year, a disappointing holiday season performance that capped a difficult year for a department store chain facing wide—ranging challenges.
2017年6月六级真题(第一套)阅读 Section C
Meanwhile, preference for private over public services made management even more difficult.
2018年12月六级真题(第二套)听力 Section C
Outsiders may then find it difficult to determine your contributions and strengths.
2019年12月六级真题(第一套)听力 Section C
simultaneous interpreting, putting someone's words into another language more or less as they speak, sounds to me like the more difficult.
2016年6月六级真题(第一套)听力 Section A
Such difficult economic times may leave many adolescents confused about their roles in society.
2016年6月六级真题(第三套)阅读 Section A
This generated little commerce for downtown businesses in the evenings, which made business and generating tax revenue for municipal upkeep difficult.
2017年12月六级真题(第一套)阅读 Section C
Unless you were prepared to pay, they were increasingly difficult to obtain for any but the most severely disabled.
2018年12月六级真题(第二套)听力 Section C
We believe that at least part of the problem lies in places other than the interaction between scientists and members of the media, and exists because for one thing we underestimate how difficult it is for scientists to communicate effectively with a dive
2018年12月六级真题(第三套)阅读 Section C
We just wrapped up a project with a difficult client last week.
2019年6月六级真题(第一套)听力 Section A
We might use the word \negative\ to describe more difficult emotions but it doesn't mean those emotions are bad or we shouldn't have them.
2016年12月六级真题(第二套)听力 Section C
When I faced difficult work, like thinking through an article idea or editing the same draft for the hundredth time, for example, a more sinister screen would draw me in.
2017年12月六级真题(第一套)阅读 Section B
While farming is often difficult for both the body and mine, Sanchez says he and many of his fellow young farmers are motivated by desire to set a new standard for agriculture.
2019年12月六级真题(第二套)听力 Section B