1.
Are postcards cheaper to send than a letter ?
寄明信片比寄信便宜吗？
2.
Oh dear! I forgot to post the letter.
哎呀!我忘了寄信。
3.
Hello, may I help you, sir?
先生，你要寄信吗? ?
4.
I'd like to mail this letter to China by certified mail.
我想把这封信按保寄信寄到中国去。
5.
send a letter, telegram, message, etc
寄信、 发电报、 传送信息
6.
And offer to send letters to people who are not collecting stamps.
主动给那些不集邮的人寄寄信。
7.
You can't send a letter overseas by certified mail. If you want, you can register it.
海外信件不能寄保寄。如果愿意，你可以寄挂号信。
8.
How would you send this letter, by air mail or regular mail?
这封信你怎么个寄法，是航空邮寄还是寄平信？
9.
The information is sent in a sealed envelope.
信息用封口的信封寄出。
10.
Do you want to send it as an ordinary or registered letter.
您想寄平信还是挂号信？
11.
Do you want to send it as ordinary or registered letter?
寄平信还是挂号信？
12.
I surely believe I send out that letter.
我确信我寄出了那封信。
13.
Do you want to send it by air mail or by ordinary mail?
你想寄平信还是寄航空邮件？
14.
It's2yuan by surface mail and3.6yuan by air.
寄平信2元，寄航空要3元6角。
15.
I'm sending the letter today; the packet will follow (later).
我今天寄这封信，包裹随后再寄。
16.
I promise I'll remember to post your letter.
我一定记得寄你的信。
17.
You'd better send the letter by air.
这封信你最好寄航空。
18.
We sent the letter by airmail.
我们寄了封航空信。