envelope
noun
ˈenvələʊp
noun
1
a
thin
paper
cover
in
which
you
put
and
send
a
letter
信封
envelopes
and
stamps
信封和邮票
She
tore
open
the
envelope
and
frantically
read
the
letter.
她撕开信封慌忙看信。
He
got
a
job
stuffing
envelopes
(=filling
them
with
letters)
at
the
campaign
headquarters.
他找了一份在竞选总部装信封的工作。
2
a
layer
of
something
that
surrounds
something
else
外裹物; 外层
[+
of
]
an
envelope
of
gases
around
the
planet
包围着行星的大气层
3
push the envelope
to
try
to
go
beyond
the
normal
limits
of
something
[美] 超出正常限度
AmE
a
musician
who
pushes
the
envelope
of
improvisation
突破即兴演奏界限的音乐家