On(the)air
(电视、广播)正在直播的
Ready? We're on the air in five, four, three…
准备好了吗?我们马上开始直播,5,4,3……
in the Air
在空中
Look! There is a jet in the air.
看!天上有架喷气式飞机。
clear the air
打消疑惑
Let's discuss this frankly.
It'll be better if we clear the air.
我们还是开诚布公的谈一谈吧。
最好把事情都说明白了。
in the open air
在户外
In summer I think it’s nice to eat in the open air.
夏天的时候在户外用餐特别惬意。
,