名词
中文翻译：出发港证明书
同义词：
['departure certificate', 'port of departure certificate']
例句：
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1. The airline providedus with a certificate of departure port to ensure our travel safety.
航空公司为我们提供了出发港证明书，以确保我们的旅行安全。
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2.The passenger boarded the ship at the port of departure and received the certificate of departure port from the customs.
乘客在出发港登船，并从海关获得了出发港证明书。
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3. The pilot needed the certificate of departure port to clear customs before taking off.
飞行员需要出发港证明书才能在起飞前清关。