他们听不到她的消息时，唯恐发生了最坏的事。

When they did not hear from her, they feared the worst.

《牛津词典》

胡克有一种沮丧的欲望，想发表他的临终遗言，唯恐马上就没有时间了。

Hook felt a gloomy desire to make his dying speech, lest presently there should be no time for it.

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我们把文件看了一遍又一遍，唯恐忽略了其中的什么要点。

We went over the document again and again lest we should miss any of the main points.

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