metabolism|metabolisms

锻炼可以加快你的新陈代谢。

Exercise can speed up your ___metabolism.

不同动物的新陈代谢速度差异很大。

Different animals have very different ___metabolisms.

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.