So what we'll start with today is talking about the technique that's primarily used to actually experimentally figure out what these different energy levels are.

因此，我们今天首先要讨论的就是,最常用来在实验上,确定不同能级的技术。

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This is a kind of argument that we use all the time.

这是我们常用的一种论证方式

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Or, especially when talking about estimates of the variance, we sometimes say S2 or we say standard deviation2.

又或者,在讨论方差估计的时候,我们常用S2,称为标准差的平方

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include stdio h The next line of code says include standard io.h which just as a little sanity check contains among other things, printf.

接着的一行代码写着,这个库文件包含一些我们常用的函数,譬如，printf函数。

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