metabolism

锻炼可以加快你的新陈代谢。

Exercise can speed up your ___metabolism.

随着年龄增长，人体的新陈代谢会逐渐减慢。

As people age, their ___metabolism naturally slows down.

这种药物在体内的代谢速度因人而异。

The ___metabolism of this drug varies from person to person.