可以设置摩擦系数成任何非负值。

The coefficient of friction can be set to any nonnegative value.

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在过去发表的非平衡热力学文献中所采用的一种方法就是对熵产生的速率重新加以定义，其目的在于确保熵产生的速率为非负值。

Giving a new definition for the rate of entropy production is a proof method adopted in some papers published recent years to guarantee that the rate is non-negative.

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