envelope是什么意思

2024-07-16 09:37| 来源: 网络整理| 查看: 265

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

any wrapper or covering

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

a natural covering (as by a fluid);

"the spacecraft detected an envelope of gas around the comet"

the maximum operating capability of a system (especially an aircraft);

"test pilots try to push the envelope"

the bag containing the gas in a balloon

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