- certified mail
- 保证: pledge; guarantee; assure; e ...
- 邮件: mail; post; postal matter
- 验证邮件地址: retype email address
- 单证邮寄单: list of documents by airmail
- 邮件: mail; post; postal matter 挂号邮件 registered post; 航空邮件 air mail; 小包邮件 a postal packet
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