用letting down造句子，“letting down”造句

3、He has spent all his life in letting down buckets into empty wells;and he is frittering away his age in trying to draw them up again.

1、I have a dread of letting down Ray's contributors, who are expecting to see their work in his magazine.

2、A patient who just recovered will suffer a relapse if letting down his guard; a strong person may die suddenly because of neglect.