1.
"The postage certificates which are contaminated, incomplete or illegible due to fading or discolouring, and stamp patterns cut from stamped envelopes, stamped postcards and stamped aerogrammes shall not be used."
污染、残缺或者褪色、变色,难以辨认的;从邮资信封、邮资明信片、邮资邮简上剪下的邮票图案。
2.
envelope ,with reply paid postal marking
信封,盖有邮资由收信人负担的邮戳
3.
Self-addressed stamped envelope.
回邮信封贴足邮资写明发信人（自己）姓名地址的回信信封
4.
Indicia: Formal mailing information or permit, as on business reply envelopes or bulk mail, printed on envelope or item to be mailed.
邮政标记:印于信封上或邮寄物品上，例如商业回邮信封或在大量邮寄的正式邮寄资料或执照。
5.
The postage for airmail is 50 cents.
一封航空信的邮资是五十美分。
6.
An envelope or wrapper for mail.
封套，信封为邮寄而制的信封或封套
7.
Special postal envelope Envelopes of domestic express mail
GB/T17128.1-1997邮政特种信封邮政快件信封
8.
Stick a stamp on the letter.
给这封信贴上邮票。
9.
He gave the postman a letter.
他把一封信交给邮递员。
10.
The postman left a letter.
邮递员送来了一封信。
11.
He glued the stamp to the envelope.
他把邮票粘到信封上。
12.
This letter is postmarked London.
这封信盖有伦敦的邮戳。
13.
The letter is postmarked New York .
这封信盖着纽约的邮戳。
14.
penalty envelope
免费邮递公文的信封
15.
The postman has left this letter for you.
邮差给你送来这封信。
16.
Take the letter to the post.
请把这封信投到邮筒里。
17.
Take this letter to the post, please.
把这封信投入邮筒。
18.
He stuck a stamp on the letter.
他给这封信贴上邮票。