名詞 envelope:

1. a flat rectangular paper container for papers
2. any wrapper or covering
3. a curve that is tangent to each of a family of curves
4. a natural covering (as by a fluid)
5. the maximum operating capability of a system
6. the bag containing the gas in a balloon
   同義詞：gasbag

1. Does the name on the envelope correspond with the name on the letter inside?
   信封上的名字與里面信上的名字是否相同?
2. There are several enclosures in the envelope.
   信封內(nèi)裝有幾份附件。
3. He steamed the stamp off the envelope.
   他用蒸汽把信封上的郵票揭下來。
4. I use a prepaid envelope.
   我用了一個郵資已付的信封。
5. A paper or thin cardboard envelope for a phonograph record.
   唱片套子留聲機唱片的紙?zhí)谆虮〖埌宸馓?/div>
6. He glued a stamp onto the envelope.
   他把郵票貼在信封上。
7. The envelope was firmly sealed.
   這個信封封得很嚴實。
8. He addressed the envelope before mailing the letter.
   寄信前，他在信封上寫上地址。

en.ve.lope

n.（名詞）
A flat, folded paper container, especially for a letter.
信封：扁平，裝折疊紙的容器，尤其用來裝信
Something that envelops; a wrapping.
包裹物；封皮
Biology An enclosing structure or cover, such as a membrane or the outer coat of a virus.
【生物學】 膜，包袋：包裹性的結(jié)構(gòu)或包皮，如膜或病毒的外殼
The bag containing the gas in a balloon or an airship.
氣囊：氣球或飛艇上容納氣體的袋裝物
The set of limitations within which a technological system, especially an aircraft, can perform safely and effectively.
極限數(shù)據(jù)：技術(shù)系統(tǒng)，尤其是飛機，能夠安全有效運轉(zhuǎn)的一系列界限
The coma of a comet.
彗星的彗發(fā)
Mathematics A curve or surface that is tangent to every one of a family of curves or surfaces.
【數(shù)學】 包絡(luò)線，包絡(luò)面：一條曲線或一個曲面，與一組曲線或曲面中的每一曲線或曲面保持正切

<習慣用語>push the envelope
To increase the operating capabilities of a technological system.
增強技術(shù)系統(tǒng)的運轉(zhuǎn)能力
來源：
French enveloppe
法語 enveloppe
from envelopper [to envelop]
源自 envelopper [包住]
from Old French envoloper * see envelop
源自 古法語 envoloper *參見 envelop