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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? (责任编辑：admin) |