骨折，不管什么原因，都是因为它强度小于它所能承受的应力。

If a bone fractures, for whatever reason, its strength is less than the stress it is subjected to.

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但是，以最大速率进行适应，要求承受的应力达到您身体的极限。

But adapting at the maximal rate requires that your body be stressed to its limit.

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通过建立脊柱前屈的力学模型，定量计算腰骶椎间盘承受的应力。

Based on mechanics model of spinal flexion, stress upon lumber intervertebral disc was quantitatively calculated.

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