• n. 信封，封皮；包膜；[天] 包层；包迹

来自envelop,包围，围住。

envelope

envelope: [18] English borrowed envelope from French enveloppe in the sense ‘wrapper’, and more specifically ‘cover for a letter’, at the start of the 18th century. It was a derivative of the verb envelopper ‘wrap’, whose ancestor, envoloper, gave English envelop in the 14th century. As in the case of its first cousin develop, the origin of the verb remains a mystery.

It is a compound formed from the prefix en- ‘in’ and voloper ‘wrap’, but the source of voloper has never been satisfactorily explained. It may come from a hypothetical Celtic base *vol- ‘roll’, but an equally good candidate is late Latin *faluppa ‘husk’, from which come Italian viluppo ‘bundle’ and viluppare ‘wrap’.
=> develop

envelope (n.)

"a wrapper, an enclosing cover," specifically a prepared wrapper for a letter or other paper, 1705, from French enveloppe (13c.), a back-formation from envelopper "to envelop" (see envelop).

1. Return the enclosed Donation Form today in the prepaid envelope provided.

请于今日将随函附上的捐款表格用所提供的邮资预付的信封寄回。

来自柯林斯例句

2. Under the newspaper, atop a sheet of paper, lay an envelope.

在报纸下面的一张纸上放着一个信封。

来自柯林斯例句

3. The envelope has been tampered with and then taped shut again.

信封被人动过手脚，然后又用胶带封上了。

来自柯林斯例句

4. Liz picked up the blue envelope and turned it over curiously.

莉兹拿起蓝色信封，好奇地翻过来看。

来自柯林斯例句

5. He took a largish buff envelope from his pocket.

他从口袋里掏出一个相当大的米色信封。

来自柯林斯例句