第二个主要效果上的老化骨骼系统的发生率下降，其结果在蛋白质形成的生产能力下降的有机部分骨基质。

The second principal effect of aging on the skeletal system is a decrease in the rate of protein formation that results in a decreased ability to produce the organic portion of bone matrix.

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在生命的初期，我们的膝盖骨和大腿骨之间的软骨，光滑，无任何声响，但是，随着年龄的增长，它开始老化，最终失去再生能力；

We all start life with quiet, smooth cartilage between our kneecaps and thigh bones, but over time, it becomes gray and old and doesn't regenerate;

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