When the well reaches a pool, oil usually rises up the well because of its density difference with water beneath it or because of the pressure of expanding gas trapped above it.

当井和一个水池相接时，油通常会从井里上升，因为它与井下的水的密度不同，或者因为停留在它上方的膨胀气体的压力。

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It will clear up questions about its curiously high density, whether it has ice at its poles and where its atmosphere comes from.

这将解开水星密度为何如此之高，水星的两极是否存在冰以及水星的大气从何而来等疑问。

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The density shows up in the patterns codified around Test.

密度表现了围绕测试所编码的模式。

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So if I try to rotate my 2 atoms, you see that I have to break that pi bond, because they need to be lined up so that the electron density can overlap.

如果我要试着转动两个原子，你会看到我必须要打破一个π键，因为他们需要连接起来,让那些电子能够重叠。

麻省理工公开课 - 化学原理课程节选

This should make sense because if something has a low ionization energy, that means it's not very electronegative, which means it's going to be a lot happier giving up electron density, which is essentially what you're doing -- when you're forming covalent bonds is you're sharing some of your electron density.

这应该是合理的,因为如果某物的电离能很低，这也就意味着它的电负性也不高，那么它就会更愿意,放弃一定的电子密度，而本质上这正是你在,形成共价键时所需要做的,分享你的一些电子密度。

麻省理工公开课 - 化学原理课程节选

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

Its main city, Portland, became the poster child of the "smart growth" movement by forcing up density, building an extensive light-rail system and restoring its urban core.

FORBES: New Geographer

As they announced at the meeting in San Diego, the Sloan survey team was able to pick up such a density peak at a distance of 500m light years.

ECONOMIST: Astronomy

Gas and dust would have piled up in the dead zone, increasing its density and causing it to heat up by gravitational compression.

MSN: Earth's hot formation may be reason behind water shortage