Under acute stress, the body's sympathetic nervous system prepares the body for sustained, vigorous action.

在极度紧张的情况下，人体的交感神经系统为身体有力的求生行为做了准备工作。

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The researchers found that humans and most mammals experience a potentially lethal level of heat stress at a "wet-bulb" temperature above 95 degrees sustained for six hours or more.

研究者们发现对于人类和大多数哺乳动物来说，连续六个小时或以上的95华氏度以上的极限“湿球温度”，将会使他们面临由于酷热造成的“极易死亡阶段”。

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They result from sustained contraction of face and neck muscles, often due to fatigue, stress, or frustration.

肇因于面部和颈部肌肉的持续紧缩，通常是因过度劳累、压力和挫折而产生。

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He was forced to withdraw from the coxless four when he sustained a stress fracture of the rib, leaving him with a deflated lung, and could only watch on as the crew claimed gold without him.

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Sinha observed that it's stress that is sustained, uncontrollable and overwhelming that is damaging.

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Bales' attorneys have said that he suffers from post-traumatic stress disorder and sustained a traumatic brain injury during a prior deployment to Iraq.

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