on the air 播送,广播。如:
The news will be on the air at 6p. m. 这条资讯将在下午六点播出。
off the air 指停止广播。如:
The station has gone off theair. 这家电台已停止广播。
by air 乘飞机。如:
He must have arrived by air. 他一定是坐飞机来的。
Its quicker by air than by train. 乘飞机比坐火车快。
in the air 在空中;悬而未决;感到疑虑。如:
Birds flyin the air. 鸟在空中飞。
Our plans are still in the air. 我们的计划还没有制订好。
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