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You can send the letter by airmail (regular mail, registered mail).
你可以邮寄航空信(平信、挂号信)。
youdao
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How long does it take a letter to get there by regular mail?
一封普通信寄到那里要花多长时间？
youdao
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How long does it take a letter to get there by regular mail?
一封普通信寄到那里要花多长时间？
youdao