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航空信封一般由非常薄的纸制作的。
An airmail envelope is usually made of very thin paper.
youdao
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寄一封航空信封到日本要多少钱？
How much is an airmail letter to Japan?
youdao
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噢，要的，我要一扎航空信封和一本信纸。
Oh, yes. I need a package of air mail envelopes and a writing pad.
youdao
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请用普通航空信封。
By ordinary airmail, please.
youdao
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请用普通航空信封。
By ordinary airmail, please.
youdao