on the air
广播中, 播送中
例句与用法：
A feather floats about on the air, especially on a windy day. If there is a shower of rain, the feather will get wet and heavy with water, and then it will sink straight to the ground.
羽毛会在空中四处飘动，尤其是在多风的天气。如果遇上阵雨，就会因为淋上雨水变湿就沉，然后就会垂直落回到地上。
The bombers swooped on the air base.
轰炸机突袭空军基地。
This channel comes on the air every morning at 7 am.
这个频道每天早晨7点钟开始播放。
The news will be on the air tonight.
这个新闻今晚将要广播。
在广播
That program has been on the air for 25 years now.
那节目已播放了二十五年了。
She didn't know she was on the air when she said those crazy things.
当她说那些疯狂事的时候, 她不知道已经在广播了。
That radio show is still on the air.
那个广播剧还在播送。