envelope

信封，封皮；包膜；[天] 包层；包迹英释nna thin paper cover in which you put and send a letter

1 flight envelope,飞行包线

2 nuclear envelope,核膜；核被膜

3 envelope curve,包络曲线；包迹

4 failure envelope,断裂点轨迹；破坏包络线

5 push the envelope,挑战极限；接近甚至超越安全限度；越过底线

6 glass envelope,玻璃封装；玻壳

1 envelopes and stamps.信封和邮票

2 She tore open the envelope and frantically read the letter..她撕开信封慌忙看信。

3 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。