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Most researchers expect to find that both modes of transition from one species to another are at work in evolution.

大多数研究人员希望发现从一个物种到另一个物种的两种转变模式都在进化中起作用。

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Shops are open; people are at work. But many Poles are also asking questions such as why so many of the country's political leaders were traveling on one plane and why, if as Russian authorities say, the pilot ignored warnings against trying to land in poor weather conditions.

VOA: standard.2010.04.12

The question is that both tendencies are at work within philosophy and how do we encourage one side but not the other.

问题是,两种倾向同时运作于哲学之中,我们要如何鼓励其中一种,并劝阻另一种。

耶鲁公开课 - 政治哲学导论课程节选

So I love that link and actors are very good at that. They are good at body work

所以我喜欢这种理论和实践的结合，演员们也很能接受。
他们也想工作时精力充沛，

健康管理的重要性 - SpeakingMax英语口语达人

Massachusetts, California and other states are at work on their own universal insurance schemes.

FORBES: Magazine Article

The blame should not fall entirely on the parties: bigger forces are at work.

ECONOMIST: Bagehot

More recently, the number of people of pensionable age who are at work has also risen.

ECONOMIST: Labour market