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信封 :
envelope
Relative explainations:
<jacket> <mailer> <envelop>
Examples:
1. 這個(gè)信封封得很?chē)?yán)實(shí)。
The envelope was firmly sealed.
2. 寄信前，他在信封上寫(xiě)上地址。
He addressed the envelope before mailing the letter.
3. 信封內(nèi)裝有幾份附件。
There are several enclosures in the envelope.
4. 他用蒸汽把信封上的郵票揭下來(lái)。
He steamed the stamp off the envelope.
5. 我用了一個(gè)郵資已付的信封。
I use a prepaid envelope.
6. 他把郵票貼在信封上。
He glued a stamp onto the envelope.
7. 信封（的封口）沒(méi)粘住.
The (flap of the) envelope was unstuck.
8. 這個(gè)信封開(kāi)了.
This envelope has come unstuck.