And in practical terms, we can define the efficiency as the ratio of the heat in to the work out.

在实际中，我们定义,效率为热与功的比值。

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Change the independent variable, find the change in the function, take the ratio and that's the derivative.

改变自变量,算出函数的变量,计算比值,这就是求导

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So that's a very wide sort of ratio there.

我们能得到许许多多不同比值的重复。

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the ratio will approach a definite limit.

比值会接近一个确定的极限值

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Then, that ratio will give you acceleration.

那么,比值就等于加速度

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