By the early part of the twentieth century, scientists believed that four distinct glaciations had affected North America and Europe during the Pleistocene epoch.

到二十世纪初，科学家们认为，在更新世期间，有四次不同的冰川作用对北美和欧洲产生了影响。

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Scientists believed this was because the movie made them think about their own lives and relationships.

科学家们认为，这是因为电影让他们想到了自己的生活和人际关系。

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Until recently, scientists believed that life on other planet was just a hopeful dream.

直到最近，科学家们还认为其他星球上的生命只是一个充满希望的梦。

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At the time, scientists believed that a person at the top of the mountain would only have enough oxygen to sleep.

VOA: special.2010.06.30

Scientists believed that Messner and Habeler would die without oxygen.

VOA: special.2010.06.30

Scientists believed the Tyrannosaurus ate even larger plant-eating dinosaurs.

VOA: special.2009.09.01

The national space agency, Roscosmos, said scientists believed one meteoroid had entered the atmosphere, where it burned and disintegrated into fragments.

CNN: Russia starts clean-up after meteor strike

The national space agency, Roscosmos, said scientists believed one meteoroid had entered the atmosphere, where it burned and disintegrated into fragments, according to RIA Novosti.

CNN: Report: Russian meteor blast injures at least 1,000 people

And it sympathised with the scientists' frustration at having to deal with numerous freedom of information requests from people who the scientists believed wanted to obstruct their work.

ECONOMIST: Green.view