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1·I'm tired of licking envelopes.

我舔信封都舔烦了。《牛津词典》

2·She had 500 leaflets to stuff into envelopes.

她得把500份传单装进信封里。《牛津词典》

3·Catherine put all the envelopes aside unopened.

凯瑟琳把所有信封都放了进去，一个也没打开。《柯林斯英汉双解大词典》

4·They took sheets of paper off piles, collated them and put them into envelopes.

他们从纸堆中拿出一沓一沓的纸，整理好并放入信封中。《柯林斯英汉双解大词典》

5·Please give me some envelopes.

请给我一些信封。

6·She often reuses old envelopes.

她经常重复使用旧信封。

7·We seal the back of envelopes.

我们把信封封口。

8·Please remember red envelopes!

记得给我红包哦！

9·He doesn't have any envelopes.

他没有信封。

10·Please reuse your envelopes.

信封请重复利用。

信封

1·I'm tired of licking envelopes.

我舔信封都舔烦了。《牛津词典》

2·They took sheets of paper off piles, collated them and put them into envelopes.

他们从纸堆中拿出一沓一沓的纸，整理好并放入信封中。《柯林斯英汉双解大词典》

3·He glued many envelopes yesterday.

他昨天用胶粘了很多信封。

4·Please give me some envelopes.

请给我一些信封。

5·She often reuses old envelopes.

她经常重复使用旧信封。

(1)flight envelope飞行包线

(1)nuclear envelope核膜；核被膜

(1)envelope curve包络曲线；包迹

(1)failure envelope断裂点轨迹；破坏包络线

(1)push the envelope挑战极限；接近甚至超越安全限度；越过底线

(1)glass envelope玻璃封装；玻壳