Airmail is letters and parcels sent by plane, or the system of sending them that way, as opposed to slow mail that goes by ship or truck (people still call that surface mail). As a verb, to airmail something is to send it by air.

Airmail is letters and parcels sent by planeAirmail是用飛機寄送的信件和包裹, or the system of sending them that way或指用這種方式寄送的系統, as opposed to slow mail that goes by ship or truck相對於用船或卡車運送的慢郵 (people still call that surface mail)（人們還是會叫那個surface mail平信）As a verb當動詞用的時候, to airmail something is to send it by airto airmail something就是用航空方式寄送某樣東西

You may still see airmail stickers, thin blue envelopes, and the word on post-office forms. Though actually, these days most letters between countries already travel by air, so the old special feeling is weaker than when airmail cost extra and felt fast and a bit fancy.

You may still see airmail stickers, thin blue envelopes你可能還會看到airmail貼紙、薄薄的藍色信封, and the word on post-office forms還有郵局表格上這個字Though actually不過其實, these days most letters between countries already travel by air現在大部分跨國的信件本來就是走空運, so the old special feeling is weaker所以以前那種特別感已經沒那麼強了, than when airmail cost extra and felt fast and a bit fancy比起早年airmail要加錢寄，感覺又快又有點高級的時候

It is a practical postal word, a little old-fashioned in daily talk, and it has nothing to do with email. You would not airmail a message on your phone.

It is a practical postal word這是個很實用的郵政用字, a little old-fashioned in daily talk在日常對話裡有點過時了, and it has nothing to do with email而且跟email電子郵件一點關係都沒有You would not airmail a message on your phone你不會用airmail這個字來說你用手機傳訊息