envelope[英][?env?l?up] [美][??nv??lop, ?ɑn-] 生詞本簡明釋義n.信封，封皮；殼層，外殼；包裹物；[生物學(xué)]膜，包袋復(fù)數(shù)：envelopes以下結(jié)果由 金山詞霸 提供柯林斯高階英漢詞典 短語詞組 同反義詞1.N-COUNT信封An envelope is the rectangular paper cover in which you send a letter to someone through the post.2.PHRASE挑戰(zhàn)限制尺度；突破原有底線If someone pushes the envelope, they do something to a greater degree or in a more extreme way than it has ever been done before. There's a valuable place for fashion and design that pushes the envelope a bit...在原有尺度上有所突破的時尚和設(shè)計受到人們的重視。No cinema director had a more profound effect in pushing the envelope of acceptable family entertainment.在挑戰(zhàn)家庭娛樂片的接受程度方面，沒有哪個電影導(dǎo)演比他的影響更深遠(yuǎn)。