Prof Ostrom has challenged the conventional "tragedy of the Commons" theory, arguing that societies and groups regularly devise rules and enforcement mechanisms which stop the degradation of nature.

奥斯特罗姆教授对传统的“公地悲剧”理论发起挑战，她主张，社会和团体经常制定规则和执行机制，遏制自然界的退化。

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Exactly how excess weight can influence the degradation of the brain is not certain, but Xu said there could many possible mechanisms.

准确来说超重多少会影响大脑的退化还无定论，但是Xu认为那与许多可能因素有关。

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The present paper particularly describes ultrasonic degradation of pesticide in mechanisms, influential factors, current researches and application future.

详细地阐述了超声波降解农药的机理、影响因素、研究现状及应用前景。

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Now the nice thing about this is that the degradation mechanisms seem to persist for some period of time, beyond the time at which you deliver the double stranded RNA; whereas, obviously, this mechanism here is only going to exist for as long as the anti-sense sequence is present.

而好消息是降解过程会持续一段时间,比你转入双链RNA的时间要长,但是,这种机制只会在,有反义链的时候发挥作用

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