when a football game was shown on the air.为何用介词ON

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when a football game was shown on the air.为何用介词ON
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when a football game was shown on the air.为何用介词ON
when a football game was shown on the air.为何用介词ON

when a football game was shown on the air.为何用介词ON
同学,
on the air 是固定搭配,表示正在播放的或者在广播里.

He had hardly fallen asleep when he felt a soft touch on his shoulder,I saw a very good film,which was about the Long March . 2)介词