Frederic became one of her assistants and Irene taught him the techniques required to work with radioactivity.

弗雷德里克成了她的助手之一，艾琳教他放射性工作中需要掌握的技能。

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At the same time, workers were required to discard old habits, for industrialism demanded a worker who was alert, dependable, and self-disciplined.

与此同时，工厂还要求工人们摒弃原来的习惯，因为工业制度需要机敏、可靠和自律的工人。

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Dealers are required to make the trade-ins unusable by destroying the engine, then recycle the old vehicles into scrap metal.

VOA: special.2009.08.07

And so when we say something is exponential, we're talking about in terms of the number of bits required to represent it.

所以当我们说某些东西，是指数增长的我们指的,就是代表它的比特数。

麻省理工公开课 - 计算机科学及编程导论课程节选

I think that if a classroom devolves to the point where physical force is required to gain control,

我认为，如果一个课堂秩序十分混乱，以至于要用武力来维持秩序，

反对体罚 - SpeakingMax英语口语达人

Better tracking data would be required to maximize the effectiveness of debris removal prizes.

FORBES: Beware Of Space Junk

And the cable operators aren t required to get local phone franchise agreements themselves.

FORBES: Verizon's Big TV Bet Goes Small-Town

The rest of the signatories were required to pledge not to acquire nuclear weapons.

NPR: Non-Proliferation in the 21st Century