降解英文

degradation theory: 是"降解(学)说"降解机理: Degrade mechanism

降解：degradation英 [,degrə'deɪʃ(ə)n]美 [,dɛɡrə'deʃən]n. 退化；降格，降级；堕落用法：a life of poverty and degradation 穷困潦倒的生活As the fish moves, feeds, and excretes waste, it plays a key role in the cycle of carbonsynthesis and degradation. 随着这种鱼的运动、进食和排泄废物，它在碳合成和降解循环过程中扮演了一个关键的角色。

一次性塑料袋很难降解 use-and-throw-away plastic bags are very hard / difficult to dissolve / degrade.

the theory of degradation

degradable poly bag

plastic bags are hardly degrade或者是it is hard to degrade plastic bags