这个道理可以参考著名的爱因斯坦质能方程式，E=mc2, 能量E是质量m乘以光速c的平方项。

Einstein's famous equation, E=mc2, outlines how energy is equivalent to mass times the square of the speed of light.

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因此，要想解出电离能，我们只需要将这个方程中的项变换一下位置。

So if we want to solve for ionization energy, we can just rearrange this equation.

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两个方程式只在Y项的定义上有差别，但是这个差别将使估算结果产生很大不同。

The two equations differ only in the definition of the Y term, but this difference can make a significant difference in the outcome of an estimate.

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If you knew only the third derivative of the function, you can have something quadratic in t without changing the outcome.

如果方程里有三阶导数,你就可以引入一个二次项,但是结果却不会变

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So, for example, if we're to hold the time constant, this makes it a lot simpler of an equation, because what we can end up doing is actually crossing out this whole term here.

比如说，如果我们把时间,定为常数，这使得方程,大大简化，因为我们可以把,这一项划掉。

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Remember the equation of state for Van der pV=nRT Waal's gas is not pV is equal to nRT, but p plus the attraction term.

记住范德瓦尔斯气体的状态,方程不是，而是p加上一个吸引项。

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