And we can also talk about the bond length, so we might be interested in what the bond length is, what the distance between these two nuclei are.

另外一点就是键长，我们对键的长度也感兴趣，也就是两个原子核之间的距离。

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So what we do is we pick an origin, call it zero, we put some markers there to measure distance, and we say this guy is sitting at 1,2,3,4,5.

我们现在选择一个原点,称其为零点,我们做一些标记来测量距离,这个点在五个单位长度的地方

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So these distances are the lengths of these line segments.

这些线段的长度就是距离

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