名词
中文翻译：海上邮件
同义词：
['sea packet', 'seagram']
例句：
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1. The post office is responsible for delivering sea mail to our country's borders.
邮局负责将海上邮件送达我国边境。
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2. The sender of the letter requested that it be sent by sea mail to avoid delays.
写信人要求通过海上邮件发送，以免延误。
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3. The sea mail service has been a popular way for people to send international letters.
海上邮件服务一直是人们发送国际信件的热门方式。