名詞 let down:

1. a feeling of dissatisfaction that results when your expectations are not realized
   同義詞：disappointment, letdown

動詞 let down:

1. move something or somebody to a lower position
   同義詞：lower, take down, get down, bring down
2. fail to meet the hopes or expectations of
   同義詞：disappoint

1. That's a real let down.
   這真叫人失望。
2. The girl let down her hair.
   女孩讓頭發(fā)披了下來。
3. Let down a rope so that I can climb up.
   放下繩子，讓我爬上去。
4. She let down the blind.
   她把百葉窗放下了。