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1·Don't push the envelope.

不要挑战极限。

2·Test pilots try to push the envelope.

试飞员尝试挑战极限。

3·That computer company's new laptops really push the envelope.

那家电脑公司的新型膝上型电脑真是空破极限。

4·I push the envelope to do something no one has ever done before.

我想挑战极限做一些从来没有人做过的事情。

5·Dan was always looking for new ways to up the thrill and push the envelope.

丹总是寻求新方法为刺激度推波助澜。

6·He's very brave, he's not frightened. He wants to do dangerous things, things that push the envelope.

他很勇敢，无所畏惧，他想做危险的事情，那些有点冒险意味的事情。

7·So, what could it possibly mean to… push the envelope. There has got to be more to this expression.

那么，”推信封”会是什么意思呢?这个表达有多种解释。

8·When it comes to population density (the number of people per square mile), some cities really push the envelope.

当涉及到人口密度(每平方英里上的人数)，一些城市真的要被挤爆了。

9·These 7 amazing engineering wonders push the envelope of what can be accomplished on Earth - and someday, beyond.

这七项让人叹为观止的工程奇迹在挑战人类的极限，看我们未来能在地球上创造出何种奇迹。

10·He push the envelope when he hit his wife at the party after getting drunk. She asked for divorce the next day. .

在晚会上他喝醉了酒，当众殴打了妻子，这已经超过了他太太的忍耐极限，她第二天就提出要和他离婚。