Passive air defense
un. 消极防空
🧩 词语组成解析
air
[ɛə]
n. 天空;气氛;空运;（简单易记的）曲调;
vt.& vi. 晾晒;烘干;播送;广播;
vt. 使房间通风， 透气;
🗣️ 情景例句
And so are you, I think.
我想你也如此。
Don't fly till you wings are feathered.
羽毛未丰不要飞。
It's against the rules to handle the ball in soccer.
在足球中以手触球就是犯规。