envelope

美 [ˈɑnvəˌloʊp]
英 [ˈenvələʊp]
  • n.信封;塑料封套;塑料封皮
  • 网络包络;包膜;包络线
复数:envelopes  
Envelope
n.
1.
信封a flat paper container used for sending letters in
writing paper and envelopes
信纸和信封
an airmail/padded/prepaid envelope
航空╱有垫料夹层的╱预付邮资信封
2.
塑料封套;塑料封皮a flat container made of plastic for keeping papers in

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