envelope

A paper or cardboard wrapper used to enclose letters or thin flat items, especially for mailing.

1. 1.

   A paper or cardboard wrapper used to enclose small, flat items, especially letters, for mailing.

2. 2.

   a flat (usually rectangular) container for a letter, thin package, etc.

   装信件或薄包裹的扁平容器(通常为矩形)

3. 3.

   Something that envelops; a wrapping.

4. 4.

   any wrapper or covering

   任何包装物或覆盖物

5. 5.

   A bag containing the lifting gas of a balloon or airship; fabric that encloses the gas-bags of an airship.

6. 6.

   a curve that is tangent to each of a family of curves

   与一族曲线相切的曲线

7. 7.

   A mathematical curve, surface, or higher-dimensional object that is the tangent to a given family of lines, curves, surfaces, or higher-dimensional objects.

8. 8.

   A curve that bounds another curve or set of curves, as the modulation envelope of an amplitude-modulated carrier wave in electronics.

9. 9.

   The shape of a sound, which may be controlled by a synthesizer or sampler.

10. 10.

    The information used for routing a message that is transmitted with the message but not part of its contents.

11. 11.

    An enclosing structure or cover, such as a membrane; a space between two membranes

12. 12.

    The set of limitations within which a technological system can perform safely and effectively.

13. 13.

    The nebulous covering of the head or nucleus of a comet; a coma.

14. 14.

    An earthwork in the form of a single parapet or a small rampart, sometimes raised in the ditch and sometimes beyond it.

覆盖物；包装；包络线；包络面；包络；调制包络；音色包络；音量包络；气囊；气袋

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