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The others are ordinary letters. You may send them by surface mail.
其他的都是普通信件，用平信寄出就行了。
youdao
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How much is the postage for sending a surface mail letter to Shanghai.
往上海寄封平信需要贴多少钱的邮票？
youdao
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How much is the postage for sending a surface mail letter to Shanghai.
往上海寄封平信需要贴多少钱的邮票？
youdao