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People often think that insects are small delicate creatures.

人们总是认为昆虫是脆弱的小生命。

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Cats are rather delicate creatures and they are subject to a good many ailments, but I never heard of one who suffered from insomnia.

猫是很娇气的动物，容易得的病很多很多，不过我从没听说过哪只猫失眠的。

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We do know, however, that nature has set up some very delicate hearing mechanisms for its creatures.

但是我们知道，自然界已经为它的生物们建立了一些非常精细的听觉机制。