Envelope
语法信息
有生性状态
无生命
形态构成
简单词
可数
复数形式
envelopes
例子
He wrote the address on the envelope.
他把地址写在信封上。
02
信封, 包装
any wrapper or covering
03
信封, 气囊
the bag containing the gas in a balloon
04
包络线, 操作上限
the maximum operating capability of a system (especially an aircraft)
05
包膜, 覆盖物
a natural covering (as by a fluid)
06
包络线, 包络
a curve that is tangent to each of a family of curves
