另一项关于高中社交网络的研究发现，在特定的青少年网络中，异性友谊密度越高，欺凌和攻击行为就越少。

Another study of high school social networks found less bullying and aggression the higher the density of mixed-sex friendships within a given adolescent network.

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另一项优势是潮汐的高能量密度。

A further advantage is the high energy density of the tides.

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随着对一项活动或技能的练习，你的突触密度增大，曾经是新奇而复杂的东西可以很容易变得机械而死板。

With practice of an activity or skill, your synaptic density increases, and what was once novel and complex can easily become rote and passive.

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So if we write out every term individually, what we end up with is essentially just the probability density for the first atom, then the probability density for the second atom, and then we have this last term here, and this is what ends up being the interference term.

如果我们把每一项都写出来，最后得到的就是,第一个原子的概率密度，然后是第二个原子的概率密度，然后是这最后一项，这就是干涉项。

麻省理工公开课 - 化学原理课程节选