包封;封皮;包装纸
Envelopment \En*vel"op*ment\, n. [Cf. F. enveloppement.] 1. The act of enveloping or wrapping; an inclosing or covering on all sides. 2. That which envelops or surrounds; an envelop.
envelopment n : the act of enclosing something inside something else [syn: {enclosure}, {enclosing}, {inclosure}]