| 单词 | envelope |
| 释义 | Word Frequency envelope(ˈɛnvəˌləʊp, ˈɒn-) noun 1. 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 2. any covering or wrapper 3. biology any enclosing structure, such as a membrane, shell, or skin 4. the bag enclosing the gas in a balloon 5. mathematics a curve or surface that is tangent to each one of a group of curves or surfaces 6. electronics the sealed glass or metal housing of a valve, electric light, etc 7. telecommunications the outer shape of a modulated wave, formed by the peaks of successive cycles of the carrier wave 8. push the envelope Word origin C18: from French enveloppe, from envelopper to wrap around; see envelop; sense 8 from aeronautics jargon, referring to graphs of aircraft performance |
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