您要查找的是不是：
- 寄航空信吗? Do you want to send these letters by air?
- 你想发航空信吗? Do you want to airmail it or not?
- 吗 morphine
- 寄航空信要多久? How long does it take by airmail?
- 寄航空信还是寄平信? Airmail or ordinary mail?
- 寄航空信 mail
- 请寄航空信。 Please send a letter by air.
- 是吗 is that right
- 可以吗？ Any chance?
- 请寄航空信件。 Air mail, please.
- 你好吗？ How are you?
- 寄希望于 pin one's hope on
- 对吗 is it right
- 寄给 send; post
- 你知道吗 did you know
- 是吗？ Is it really?
- 寄回 return
- 不是吗 isn't it
- 寄到 send it to; send ... to; mail ... to
- 真的吗？ No kidding?
