air短语的用法1. by air 乘飞机。如：He went to Paris by air. 他乘飞机去了巴黎。Which is faster, by air or by train? 坐飞机快还是坐火车快? 2. in the air 在空中；在流传中；渺茫。如：Birds fly in the air. 鸟在空中飞。The plan is quite (up) in the air. 计划还相当渺茫。3. on the air 在广播中。如：I heard the news on the air. 我在广播中听到了这条消息。What’s on the air this evening? 今晚有什么广播节目?

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