| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024en•ve•lope /ˈɛnvəˌloʊp, ˈɑn-/USA pronunciation n. [countable]- a flat paper container, as for a letter.
WordReference Random House Unabridged Dictionary of American English © 2024en•ve•lope (en′və lōp′, än′-),USA pronunciation n. - a flat paper container, as for a letter or thin package, usually having a gummed flap or other means of closure.
- something that envelops;
a wrapper, integument, or surrounding cover. - Biologya surrounding or enclosing structure, as a corolla or an outer membrane.
- Mathematics[Geom.]a curve or surface tangent to each member of a set of curves or surfaces.
- Radio and Television(of a modulated carrier wave) a curve connecting the peaks of a graph of the instantaneous value of the electric or magnetic component of the carrier wave as a function of time.
- Aeronauticsthe fabric structure enclosing the gasbag of an aerostat.
- Aeronauticsthe gasbag itself.
- Electronicsthe airtight glass or metal housing of a vacuum tube.
Also, envelop. - the technical limits within which an aircraft or electronic system may be safely operated.
- Idioms push the envelope, to stretch the limits, as of technological advance, social propriety, etc.
- French enveloppe, derivative of envelopper to envelop
- 1700–10
+ n. - Idiomsthe technical limits within which an aircraft or electronic system may be safely operated.
- push the envelope, to stretch established limits, as in technological advance or social innovation.
Collins Concise English Dictionary © HarperCollins Publishers:: envelope /ˈɛnvəˌləʊp ˈɒn-/ n - a flat covering of paper, usually rectangular in shape and with a flap that can be folded over and sealed, used to enclose a letter, etc
- any covering or wrapper
- any enclosing structure, such as a membrane, shell, or skin
- the bag enclosing the gas in a balloon
- a curve or surface that is tangent to each one of a group of curves or surfaces
- push the envelope ⇒ informal to push the boundaries of what is possible
Etymology: 18th Century: from French enveloppe, from envelopper to wrap around; see envelop; sense 8 from aeronautics jargon, referring to graphs of aircraft performance |