airmail
n [U] mail carried by air 航空邮件
send a letter (by) airmail 寄航空信
[attrib 作定语]
an airmail envelope 航空信封
an airmail edition, eg of a newspaper or magazine, printed on special light paper 航空版（如用特种薄纸印的报刊）. v [Tn]
send (sth) by airmail 用航空邮寄（某物）.