envelopment
  包封;封皮;包裝紙
  En·vel·op·ment n.
  1. The act of enveloping or wrapping; an inclosing or covering on all sides.
  2. That which envelops or surrounds; an envelop.
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  envelopment
       n : the act of enclosing something inside something else [syn: enclosure,
            enclosing, inclosure]