Newman notes that Portland has about the same population as Perth and had a similar population density at the time.

纽曼指出，波特兰的人口与珀斯大致相同，而且它们当时的人口密度相近。

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The stability of the new materials suggests a way to increase energy density at the pack level, Chamberlain says.

这一新材料的稳定性提供了提高能量密度的级别，张伯伦说。

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So, again we can use these probability density plots, which are just a plot of psi squared, where the density of the dots is proportional to the density, the probability density, at that point.

同样的我们可以利用这些概率密度图，这是psi的平方的图，这里面点的密度，正比于概率密度。

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So, one way we could look at it is by looking at this density dot diagram, where the density of the dots correlates to the probability density.

其中一个理解它的方法,就是通过看这个密度点图，这里点的密度,和概率密度想关联的。

麻省理工公开课 - 化学原理课程节选

So we can see if we look at the probability density plot, we can see there's a place where the probability density of is actually going to be zero.

就能看到,有些地方，找到一个电子的,概率密度,我们可以考虑。

麻省理工公开课 - 化学原理课程节选

And when we take the wave function and square it, that's going to be equal to the probability density of finding an electron at some point in your atom.

当我们把波函数平方时，就等于在某处,找到一个电子的概率密度。

麻省理工公开课 - 化学原理课程节选

It also looks at the relationship between parasite density in people and the rate at which humans transfer those parasites back to the mosquitoes that carry them.

ECONOMIST: Linking up computers to defeat malaria

In Orkney, some organic farmers produce salmon at about half the density of conventional farms, without toxic chemicals or colourings.

ECONOMIST: Pressure is mounting to do something about salmon farms

If you take the numbers counted, give consideration to their catholic tastes in terms of habitat, the density at which they can breed, and scale it up, the estimate is 53, 900 pairs!

BBC: Bristol - In your garden: which birds rule?