s being ten more than forty
conj. 以免, 唯恐, 免得
1. I spoke softly lest I wake the baby.
我轻声说话,以免吵醒宝宝。
2. She studied hard lest she fail the exam.
她努力学习,以免考试不及格。
3. He locked the door lest someone break in.
他锁上门,以免有人闯入。