核心问题
in the air 与 on the air 和 by air 有什么区别?
词典解答
in the air 的意思是：“在空中”“在流传中”：
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He carried a stick that he swung in the air as he walked. 当他走路时，手里拿一根手杖在空中挥舞。
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Wild rumors were in the air. 荒唐的谣言四起。
而 on the air 的意思是:(用无线电、电视)播送:
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She has some difficulty in understanding the English programmes on the air. (SEFC, 1B, p.78) 她很难听懂电台广播的英语节目。
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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。
by air 则是“乘飞机”的意思,相当于 by plane:
He often travels by air. 他常坐飞机旅行。