A letdown is the flat feeling — or the event itself — when something is not as good as you hoped. The film, the concert, the holiday, the ending of a book: you built it up in your head, and the real thing was smaller. People say What a letdown after a match their team should have won, or after a talk that sounded exciting on the poster.

A letdown is the flat feeling — or the event itselfletdown是指那種洩氣的感覺，或是那件事本身 when something is not as good as you hoped發生在某件事沒有你希望的那麼好的時候 The film, the concert, the holiday, the ending of a book電影、演唱會、假期、一本書的結局 you built it up in your head你在心裡把它想得很棒 and the real thing was smaller結果實際的東西比較小 People say What a letdown大家會說「What a letdown」 after a match their team should have won在自己支持的隊伍本來應該贏卻沒贏的比賽之後 or after a talk that sounded exciting on the poster或是一場海報看起來很精彩、結果卻不然的演講之後

It comes from let down, the verb that means to disappoint someone (Don’t let me down). The noun is often one word, letdown; you will also see let-down.

It comes from let down它來自let down the verb that means to disappoint someone這個動詞的意思是讓某人失望 (Don't let me down)（像Don't let me down這句話） The noun is often one word, letdown當名詞的時候常常寫成一個字letdown you will also see let-down你也會看到寫成let-down

It is everyday English, a little informal, and it always needs that gap between hope and what arrived. A thing can be fine on its own and still be a letdown if the promise was bigger.

It is everyday English, a little informal這是日常英文，有點口語 and it always needs that gap between hope and what arrived而且一定要有「期望」跟「實際結果」之間的落差 A thing can be fine on its own一件事本身可以還不錯 and still be a letdown但仍然算是個letdown if the promise was bigger只要原本的期待更大