代谢

代谢	dài xiè	replacement / substitution / metabolism (biol.)
代	dài	to be a substitute for; to act on behalf of; to replace; to substitute / generation; dynasty; age; period; (historical) era; (geological) eon
谢	Xiè	surname Xie
谢	xiè	to thank / (bound form) to apologize / (bound form) to decline; to refuse / (bound form) (of flowers, leaves etc) to wither