n.松劲，减低，减退，松弛
He found himself completely unable to suppress a sense of disappointment, of letdown.
他感到自己有一种完全无法抑制的受挫和失望的感觉.
The movie was a letdown.
那电影真令人失望.
It's really a letdown to let Tom join us.
让汤姆加入我们真是一件扫兴的事情.
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