The different noise conditions had quite different after-effects when the subjects were required to proofread written material under conditions of no noise.

当测试对象被要求在无噪声条件下对书面材料进行校对时，不同的噪声条件会产生不同的后效应。

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During the whole of this session, their attention is passive; they listen to the music but make no attempt to learn the material.

在整个过程中，人们的注意力是被动的；他们聆听音乐，但不花任何努力在学习材料上。

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But experts say no-one knows how large the world stockpile of nuclear material is because not every country reports what it's producing.

VOA: standard.2010.04.06

But a rumor of a bug in a device that Motorola knows isn't ready for consumers -- and has no material effect on any official launch date -- simply doesn't matter.

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There didn't appear to be any hazardous-material crews, and no neighbors were evacuated.

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