1. 信封；封皮，封套
2. 包裹物，包装物；覆盖物；套，罩
3. 外表；外(机)壳，外层，壳层
4.【航空学】(飞船或飞艇的)蒙皮；(飞船、飞艇或气球的)气囊
5.（特定飞机或系统等的）极限数据，（飞行）速度极限
6.【生物学】包袋，膜；【植物学】包被；围绕部分(如花冠)
7.【几何学】包迹，包络线；包络面
8.【电信学】包络(曲)线
9.【天文学】包层 英语解释
- a curve that is tangent to each of a family of curves
- the maximum operating capability of a system
- any wrapper or covering
- the bag containing the gas in a balloon
- a natural covering (as by a fluid)
- a flat rectangular paper container for papers