airmail
柯林斯词典
1. N-UNCOUNT Airmail is the system of sending letters, parcels, and goods by air. 航空郵遞
...an airmail letter. …一封航空信。
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1. N-UNCOUNT Airmail is the system of sending letters, parcels, and goods by air. 航空郵遞
...an airmail letter. …一封航空信。