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Envelope
01
信封
a thin, paper cover in which we put and send a letter
02
信封, 包装
any wrapper or covering
03
包络, 气球的袋子
the bag containing the gas in a balloon
04
操作包络, 最大操作能力
the maximum operating capability of a system (especially an aircraft)
05
包层
a natural covering (as by a fluid)
06
包络, 包络线
a curve that is tangent to each of a family of curves
envelope
n
例子
The envelope contained a surprise birthday card.
She found an old envelope with photos in it.
She handed me an envelope with a note inside.
He wrote the address on the envelope.
I need to buy some envelopes for my Christmas cards.
