Surface mail or air mail?

普通邮件还是航空邮件?

Air mail or ordinary mail?

航空邮寄还是平邮？

Ordinary mail or air mail?

您寄普通邮件，还是航空邮件？

Send it by air mail!

用航空邮件寄吧!

What's the air mail rate?

航空邮资多少？

How much is the by air mail?

寄航空邮件要多少钱?

How would you like to send it, air mail or ordinary mail?

你想怎么寄, 航空邮件还是普通邮件?

I want to send this letter to China, by air mail.

我想把这封信航空邮到中国。

He sent the letter by air mail so that it might reach them in time.

他空邮这份信的以便他们能按时收到。

He sent the letter by air mail, so that it might reach them in good time.

我用航空邮件发出这封信，以便他们及早收到。