同义词： airmail letter air letter aerogram
以上来源于: WordNet
N an airmail letter written on a single sheet of lightweight paper that folds and is sealed to form an envelope 无线电报 (Also called air letter)
radiotelegraphy , marconigram
Airmail paper: Light-weight, high grade writing papers invariably made from rag for strength. One of the common usages is for aerogramme.
空邮纸：轻身高级书写用纸，多用破布造成，质地结实。常用作航空邮柬。
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