lest

conj.

唯恐；以免；惟恐；生怕

1. They spoke in whispers lest they should be heard.
   他们低声说话，唯恐被别人听见。
2. He took a flashlight lest it should get dark before he returned.
   为了预防回来以前天就黑了，所以他带着手电筒。
3. I got up early lest I should miss the train.
   我早起以免错过了火车。
4. We talked in a low voice lest we should wake the baby up.
   我们小声说话以免吵醒婴儿。
5. I was afraid lest the new car should be stolen.
   我担心新汽车会被偷走。

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