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4.Air Travel [00:01.46]４、航空之旅 [00:02.93](1)Buying Tickets and Making Reservations [00:05.41]（１）购买机票和订位 [00:07.89]Model Dialogs [00:09.04]标准对话 [00:10.19]Dialog 1 Reserving Two Seats to New York [00:12.75]对话１ 预订两个到纽约的座位...