Sure. What you need to do is to put a stamp with enough postage and mark on the cover with "By Airmail".

没问题，你只要贴足够的邮资，并在上面注明“航空邮件”即可。

youdao

Postmark is an official mark printed over a postage stamp.

邮戳是印于邮票上的官方戳记。

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Mark Twain will be honored by the U. S. Postal Service, which will debut a new Mark Twain "forever" postage stamp on June 25.

美国邮政为了纪念作家马克吐温，将于6月25日发行一枚印有他的头像和标注有“永远”字样的邮票。

youdao

Mark Twain will be honored by the U. S. Postal Service, which will debut a new Mark Twain "forever" postage stamp on June 25.

美国邮政为了纪念作家马克吐温，将于6月25日发行一枚印有他的头像和标注有“永远”字样的邮票。

youdao