Only about a third of teenagers are expected to work this summer, the lowest levels in 60 years, according to the Center for Labor Market Studies at Northeastern University.

仅由三分之一的青少年期望暑假工作，根据美国东北大学劳动力市场研究中心的报告来看，已达到60年来最低水平。

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Archimedes spent his life in philosophical and mathematical studies. To the Greeks of his day, manual labor was degrading, and they looked down upon experimentation with distaste.

阿基米德毕生从事哲学和数学研究。对于他那个时代的希腊人来说，体力劳动是丢人的，他们厌恶和看不起实验工作。

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Most previous studies of intrapartum interventions have focused on active labor, showing little effect on cesarean delivery rates.

大多数先前的分娩期介入研究已经关注主动分娩，显示在剖宫产率上影响很少。

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"It's a basic, core issue of standards for working people, " said Mr. Rhomberg, who studies labor markets.

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Differential tuition could work similarly to scholarships in terms of incentivizing students to choose certain fields of study, said Brewer, a labor economist who studies education policy.

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"This is an industry where if you get your costs out of line and business is not so good, you're dead, " says Sam Peltzman, a University of Chicago business school economics professor who studies labor and the airline industry.

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