Grown this way, smooth muscle secretes collagen, a structural protein that is, among several other things in the body, an important component of the walls of blood vessels.
采取这种方式生长，平滑肌可分泌胶原，一种结构蛋白，是人体中除其它几种物质外组成血管壁的重要成分。
Protein is a main structural component of all muscle tissues and is needed for muscle growth and repair. Foods rich in protein include meat, fish, eggs, dairy products and legumes.
蛋白质是组成肌肉组织的主要物质，肌肉的生长和修复都需要它，富含蛋白质的食物包括肉类、鱼类、蛋类、乳制品和豆类。
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