| 单词 | envelope |
| 释义 | envelope['envələup]n. 信封, 封套, 封袋【医】 膜, 包袋 envelope en.ve.lope AHD: [µn“v…-l½p”, ¼n“-] D.J. [6env*7l*&p, 6Kn-]K.K. [6Wnv*7lop, 6$n-]n.（名词）1. A flat, folded paper container, especially for a letter.信封：扁平，装折叠纸的容器，尤其用来装信2. Something that envelops; a wrapping.包裹物；封皮3. Biology An enclosing structure or cover, such as a membrane or the outer coat of a virus.【生物学】 膜，包袋：包裹性的结构或包皮，如膜或病毒的外壳4. The bag containing the gas in a balloon or an airship.气囊：气球或飞艇上容纳气体的袋装物5. The set of limitations within which a technological system, especially an aircraft, can perform safely and effectively.极限数据：技术系统，尤其是飞机，能够安全有效运转的一系列界限6. The coma of a comet.彗星的彗发7. Mathematics A curve or surface that is tangent to every one of a family of curves or surfaces.【数学】 包络线，包络面：一条曲线或一个曲面，与一组曲线或曲面中的每一曲线或曲面保持正切习惯用语:push the envelope To increase the operating capabilities of a technological system.增强技术系统的运转能力语源:1. French enveloppe 法语 enveloppe 2. from envelopper [to envelop] 源自 envelopper [包住] 3. from Old French envoloper * see envelop 源自 古法语 envoloper *参见 envelop |
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