envelopes

英 ['envələʊps] 美 ['envələʊps]

• 包络线

英英释义

名词 envelope:

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

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 (especially an aircraft)

6. the bag containing the gas in a balloon

动词 envelop:

1. enclose or enfold completely with or as if with a covering