名词
中文翻译：Unknown
同义词：
['passenger card', 'ticket', 'boarding pass']
例句：
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1. I need to check my passport before boarding the plane.
我需要在登机前检查一下护照。
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2. The airlines have made it easier for passengers to rebook their flights.
航空公司已经使乘客更容易重新预订航班。
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3. The flight attendant handed out boarding passes to all passengers.
空乘人员向所有乘客发放登机牌。