One type of pattern was of a specific density and was to be classified as dense, while the second type of pattern could vary in density, but was always less dense than the first one.

一种图案具有特定的密集度，被归为“密集”类，另一类图案的密集程度不同，但都比第一种的密集程度低。

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Because the second kind, low-density lipoprotein (LDL), get smaller and smaller until they're tiny enough to enter the walls of your blood vessels and attach themselves like a bad houseguest.

因为还有第二种胆固醇，即低密度脂蛋白(LDL) LD L变得越来越小直到他们足够小能进入血管壁，然后依附在血管壁上。

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High-density polyethylene and low-density polyethylene were the second and third place polymers.

高密度聚乙烯和低密度聚乙烯是在名单中排在二位和三位的高聚物。

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The first one will be above and below the bond axis is where we'll see the electron density, and the second will be perpendicular to that, so it will be a density in front of and behind the bond axis.

第一个是在键轴之上和之下,我们可以看到电子密度，另外一个垂直于它，所以在键轴之前和之后有电子密度。

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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。

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Then we go negative and we go through zero again, which correlates to the second area of zero, that shows up also in our probability density plot, and then we're positive again 0 and approach zero as we go to infinity for r.

并且再次经过,这和，第二块等于0的区域相关联,这也在,我们的概率密度图里反映出来了，然后它又成了正的,并且当r趋于无穷时它趋于。

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