We sent the letter by air mail.
我们通过空邮寄信。
I shall send the letter by air.
我要由航空寄这封信。
Please send the letter by air.
请寄航空信件。
You'd better send the letter by air.
这封信你最好寄航空。
We sent the letter by air mail in order that it might reach them in good time.
这封信我们航空寄去，以便他们能及时收到。
We sent the letter to them by air.
我们通过航空寄那封信。
What's the standard rate to send a letter to Beijing by air?
寄一封平信到北京的标准空邮收费是多少？
What's the standard rate to send a letter to Beijing by air?
寄一封平信到北京的标准空邮收费是多少？
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