let.down

letdown的音标和读音：
DJ音标发音： [ˈletˌdaun]
KK音标发音： [ˈlɛtˌdaʊn]

letdown的词性：
n.（名词）

1. A decrease, decline, or relaxation, as of effort or energy.
放松，弛缓，衰落：努力或力量方面的减少、降低或放松

2. A disappointment:
失望、沮丧：

The cancellation of the game was a real letdown.
比赛取消真是令人失望

3. The descent made by an aircraft in order to land.
飞机的程序下降：飞机为了着陆而作的下降飞行