envelope
🇺🇸
/ˈenvələʊp/
🇬🇧
/ˈenvələʊp/
noun
B2
A flat paper cover for sending letters.
I put the letter in an envelope and mailed it.
我把信放进信封然后寄了出去。
C1
A flat plastic cover for holding papers.
The documents were stored in a clear plastic envelope.
文件存放在透明的塑料信封里。
translation
信封, 塑料文件袋
词形变化
Plural
envelopes