Some see evidence of man reaching a physical limit (at least without illegal doping).

一些人认为人类已经要达到极限了(起码在没服过违禁药品情况下)。

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I have never pushed myself beyond my physical limit above the clouds, as I am well aware that it is a recipe for disaster.

我从不在云层之上让自己做超出自己极限的事，因为我很清醒地知道这是走向灾难的秘诀。

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The Olympics is a stage show of strength, the will, skill and natural beauty, as well as the physical limit, to win a few million viewers in mind the favor.

奥运是一个舞台，展现着力量、意志、技巧和自然的美，以及生理上的极限，赢得了数以亿记观众的青睐。

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The National Association for Sport and Physical Education says twenty to thirty students in a P.E.class should be the limit.

VOA: special.2009.08.06

The wireless subwoofer also features patented Philips DoubleBASS technology to generate a deep and powerful bass performance and giving the perception of offering bass notes below the physical limit of the speaker.

ENGADGET: blogger-avatar

That may be slightly bearish for the gold market as it could limit physical buying interest this week, due to demand from China slowing during its holiday season.

FORBES: A.M. Kitco Metals Roundup: Gold Solidly Lower, Hits 5-Week Low, on Fresh Technical Selling

Leg pain, in turn, can cause people to limit their physical activity, posing a threat to their overall physical health.

WSJ: New Tactics to Treat Artery Disease That Harms Legs