Don't push the envelope.

不要挑战极限。

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Test pilots try to push the envelope.

试飞员尝试挑战极限。

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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。

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"It's absolutely necessary that we continue to push the envelope in terms of try to develop new innovative and more natural ways of effectively treating arthritis."

VOA: standard.2010.08.11

Brandon Gutman: What is American Express doing in 2011 to push the envelope on customer service?

FORBES: Why American Express Is Raising The Bar On Customer Service

It has created a cadre of engineers who can push the envelope on products reliably.

FORBES: The Galaxy S4, Samsung's Last Act in Apple's Shadow

For us to push the envelope of what can be done in Antarctica, that felt good.

BBC: Polar express