Air Mail Letter

• 航空信件

Air Mail Letter的用法和样例：

例句

1. It costs two dollars to send an airmail letter to the United States of America.
   寄到美国的航空信件邮资是两块钱。
2. An air-mail letter in the form of a lightweight sheet of stationery that folds into its own envelope for mailing at a relatively low postage rate.
   航空邮件写于轻薄纸张之上，装入专用信封之中以较低邮费投递的航空信件。