The mechanism of polymer degradation by ultraviolet radiations is not agreed upon by experts.

关于紫外线辐射使聚合物降解的原理，专家们是有分歧的。

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The effects of ultrasonic degradation of polymer in solution are reviewed in the paper. The mechanism and the kinetics of ultrasonic degradation of polymer in solution are introduced.

本文论述了聚合物溶液超声降解的影响因素；对超声波降解机理及超声降解动力学进行了讨论。

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The structures, synthetic methods, insectical mechanism, degradation, together with environmental safety of benzoyl urea chitin synthesis inhibitors were reviewed in this paper.

对苯甲酰基脲类几丁质合成抑制剂的结构、合成方法、作用机制、代谢及环境安全性等进行了评述。

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While it's true that the National Ecosystem Assessment doesn't provide a mechanism for transferring the costs of environmental degradation onto the farmer or developer who wants to plough up a wood or concrete over a floodplain, the scientists who compiled the report say decisions about how to implement their findings should be left to legislators.

BBC: Putting a price on nature