air letter
single sheet of light paper folded to form a letter that may be sent cheaply by airmail 航空邮笺（单页薄纸摺成的航空信件, 邮资较廉）.
single sheet of light paper folded to form a letter that may be sent cheaply by airmail 航空邮笺（单页薄纸摺成的航空信件, 邮资较廉）.
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