lest 連接詞 以免 ; 唯恐
例:
We dare not to play jokes on him lest he should become angry.
I am afraid lest the new bike should be stolen.
惟恐;免得
We dare not play jokes on him lest he should become angry . 我們不敢開他玩笑生怕他動氣。
擔心
I was afraid lest the new bike should be stolen . 我擔心新自行車會被偷走。