airmail [ˈeəmeɪl]

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n.航空邮件，航空邮政

a system of sending letters and parcels by aircraft

I told her to send the letter by airmail. 我叫她把那封信寄航空。
A letter sent by airmail will get to Europe quickly. 寄往欧洲的航空邮件马上就会到达。