envelop
/ɪnˈveləp/verb
1enveloped, enveloping
with obj. wrap up, cover, or surround completely包; 裹; 封; 遮盖; 笼罩：a figure enveloped in a black cloak
裹着一件黑斗篷的人影
figurative 〈喻〉a feeling of despair enveloped him.
一种绝望的感觉笼罩着他。
1.1
- (of troops) surround (an enemy force)（军队）包围（敌军）。
USAGE
Envelop is a verb, stressed on the second syllable and meaning 'wrap completely'. The noun meaning 'paper container for a letter' is envelope, stressed on the first syllable.
派生词
envelopment
noun词源
late Middle English （formerly also as invelop （e））： from Old French envoluper, from en- 'in' + a second element （also found in DEVELOP） of unknown origin.