2COVERa layer of something that surrounds something else 外裹物;外层
envelope of
an envelope of gases around the planet
包围着行星的大气层
3push the envelopeespecially American EnglishAmE to try to go beyond the normallimits of something 超出正常限度
a musician who pushes the envelope of improvisation
突破即兴演奏界限的音乐家
Examples from the Corpus
push the envelope• Each time Walters asked his employees to push the envelope, he said, "If you can dream it, you can do it."• It needs some one who understands its basictalent, some one who will help it to push the envelope of its artificialintelligence.• Both were known to push the envelope of life.
nCOLLOCATIONS
verbs
open an envelope
I opened the envelope, pulled out the document and read it.
tear/rip open an envelope (=open it quickly and roughly)
My fingers trembled as I tore open the envelope.
slit open an envelope (=open it by cutting it)
I quickly slit open the envelope.
seal an envelope (=close it)
She sealed the envelope and stuck on a stamp.
stuff envelopes (=to put letters or documents into many envelopes, for example as part of a political campaign)
We need volunteers to stuff envelopes and deliver leaflets.
adjectives
a pre-paid/stamped-addressed envelope (=with a stamp/a stamp and an address already on it)
A copy of the rules can be obtained by sending a stamped-addressed envelope to the above address.
a self-addressed envelope (=one with your own name and address on)
Enclose a self-addressed envelope with your application form.
a brown/white etc envelope
There was a large brown envelope on his desk.
a manila envelope (=made from strong brown paper)
a sealed envelope (=one that is firmly closed)
The contract was delivered by special messenger in a sealed envelope.
phrases
on the back of an envelope (=used to describe a calculation or plan that is written down quickly on any available small piece of paper)
She scribbled a few ideas on the back of an envelope.
Examples from the Corpus
envelope• That night at the meeting, Karen had a big brownenvelope in her bag.• The solution is also obvious - pleasecheckenvelopes are not too tightly packed, if in doubt use a bigger envelope!• Entries must be on the back of a postcard or envelope no bigger than 5in × 6in. 2.• The small jetwallowed in the sky, on the edge of the envelope of control.• With trembling hands Mr Utterson opened the envelope.• Cornelius sat himself down and regarded the envelopes with suspicion.
stuffing envelopes• Rae started by stuffing envelopes and in a year was directing the volunteers herself.• She also worked in abortionclinicsstuffing envelopes or providing counseling over the phone.• She doesn't think that stuffing envelopes for the Democrats once every four years makes her an activist.