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1·Be sure to come. Don't let me down.

你一定来，可别拆我的台。《新英汉大辞典》

2·You let me down doing a thing like that.

你做那样的事使我太失望了。《新英汉大辞典》

3·And He has never let me down.

他也从来没有让我失望过。

4·You desperately let me down!

你太让我失望了！

5·Please don't let me down.

不要让我失望。

6·I know you won't let me down!

我知道你们不会让我失望的。

7·You never let me down before.

不要为取悦我而去改变自己。

8·But it's still let me down.

但是仍然很让我失望。

9·Would you ever let me down?

你究竟会不会让我失望？

10·I don't know. He could have let me down.

我不知道，他或许会让我失望。