如果你比较来自森林的土壤和不是来自森林的土壤，森林土壤的变化量很可能更大。

If you compare soils from a forest with soils that don't come from a forest, the amount of variability will most likely be greater in the forest's soil.

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所以它是一个极小的变化量。

So it's an incredibly small variation.

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那么把它们加在一起就得到了f的总变化量。

So all together I get this change as a value of f.

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You have extensive properties and intensive properties The extensive properties are the ones that scale with the size of the system.

广延量,和强度量,广延量的值,随着系统的规模变化。

麻省理工公开课 - 热力学与动力学课程节选

And we saw that in fact in this case delta S of mixing, we calculated it, saw that it is positive.

实际上如果我们计算气体混合过程中,熵的变化，我们会发现这个量是正的。

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It's useful to have the average acceleration, which you can find by taking similar differences of velocities.

平均加速度也是很有用的,你可以用类似方法,取速度的变化量求出来

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