In climate system, there are many positive and negative feedback mechanisms.

在气候系统中，存在着很多的正负反馈机制。

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The system used double negative feedback, and the type of control is PI control.

系统采用双闭环负反馈控制，控制类型选择PI控制。

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Also economic system and natural system exist a negative feedback.

经济系统与自然系统之间也存在着负反馈关系。

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Also economic system and natural system exist a negative feedback.

经济系统与自然系统之间也存在着负反馈关系。

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