HGH stimulates healthy growth, cell repair and the regeneration which is necessary for muscle development.

人体生长激素能促进身体健康成长，细胞修复和再生，这对肌肉的发育是非常有必要的。

youdao

The milk also provides protein, needed by children for muscle development and growth, not found in the other drinks.

牛奶还可以提供蛋白质，这是孩子们在肌肉发育和成长过程中不可或缺的，而其他饮料里都没有这一成分。

youdao

In most people, however, muscle development is not the same in both legs, so that it is probable that the steps will be uneven.

但是，在绝大多数人左右两腿肌肉的发育并不是一样的，结果很可能左右两脚所迈的步子长短是不一致的。

youdao

High levels of testosterone make possible the development of greater muscle mass in men.

WSJ: Can Female Athletes Compete Against Men? In Shooting, Yes

The control group showed a decrease in soleus muscle mass and strength, the development of insulin resistance, and a loss of bone mineral density and resistance to breakage.

FORBES: Didn't Have Time to Exercise? Drink Some Red Wine.

Oddly, the lethal protein acts somewhat late in development, in skin and muscle cells, and the embryo dies a grisly death unless it carries the antidote.

FORBES: Just How 'Selfish' Can A Gene Really Be?