1) I want to send it by special delivery.
我要寄一封快信。
2) I need this to go express mail.
我需要寄快件。
3) She entrusted me with mailing this letter.
她托我寄这封信。
4) I want to send this as a registered mail.
我要用挂号寄信。
5) I want to have it registered.
我要寄挂号信。
6) send a letter by airmail
寄一封航空信
补充资料：请寄
1.犹请托。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条