水星是第二个在地球上密度最大的行星。

Mercury is the second most dense planet after earth.

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特点：轻酸度，是世界上密度最大的咖啡之一。

Characteristics: Light acidity, is the world's largest coffee-density one.

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实际上密度的变化是收缩和膨胀两种效应综合作用的结果。

The variation of density is caused by the effects of shrinkage and expansion.

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So, doing those probability density dot graphs, we can get an idea of the shape of those orbitals, we know that they're spherically symmetrical.

概率密度点图上,我们可以对这些轨道的形状，有个大概了解,我们知道它们是球，对称的,我们今天不讲。

麻省理工公开课 - 化学原理课程节选

So for example, that might have a formal charge of negative 1, because to some extent it has gained that much electron density that it now has a formal charge that's negative.

比如，可能它的形式电荷为负一，因为在一定程度上它得到了这么多的共用电子密度,那么它现在就有了负的形式电荷。

麻省理工公开课 - 化学原理课程节选

So what we should expect to see is one radial node, and that is what we see here 3s in the probability density plot.

个节点,这就是我们，在这概率密度图上所看到的,如果我们考虑。

麻省理工公开课 - 化学原理课程节选