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These two are urgent letters and should be sent by registered express airmail.
有两封紧急的，必须用航空挂号快件寄。
youdao
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By express mail, parcels, registered, a busy.
寄快件的，寄包裹的，寄挂号的，一片繁忙。
youdao
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By express mail, parcels, registered, a busy.
寄快件的，寄包裹的，寄挂号的，一片繁忙。
youdao