这种差异的原因可能是不同体形的动物存在很多生理差异：生长发育的速度、新陈代谢和身体构造。

These differences arise due to a number of physiological differences, including rates of growth and development, metabolism and details of body composition.

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我们确信让肌肉生长就是刺激你的肌肉组织从而产生新的肌肉蛋白，这个内在生理进程会在一段时间后产生大块肌肉。

We're convinced that growing muscle means stimulating your muscle to make new muscle proteins, a process in the body that over time accumulates into bigger muscles.

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我们习惯于把头发仅仅当作个人风格的一种反映，但是作为我们身体的一个不断生长的部分，头发与我们的生理系统息息相关。

We tend to regard hair only as a reflection of our personal style, but as a living, growing part of our body, it's also tied in to our physiology.

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