它们离地面很近，但是这些蓝莺也会在灌木密度低的森林里面筑巢。

They're pretty close to the ground, but these warblers also nest in forests that have low shrub density.

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在电子密度低的区域能观察到前质体的纤维丝。

Fine fibrils of proplastid were observed in electronic less dense region.

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还有一个密度低的区域可能是原始人类大脑的一部分。

There's also a region of low-density that could be a section of the hominid's brain.

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So, for example, we have this average level, and then it can go high where we have the peak, or it can go very low. We can also discuss sound waves, so again it's just the periodic variation of some property -- in this case we're talking about density, so we have high density areas and low density areas.

例如这是平均位置，在峰的位置水位高，在谷水位低，我们也可以,讨论声波它也是某种,量的周期变化，在这里我们,讨论的是密度,我们有高密度区和低密度区。

麻省理工公开课 - 化学原理课程节选

You can see down here its affect on cholesterol levels: that the bad fats raise the LDL levels, the low-density lipoproteins levels, that's not good for you.

在下面你可以看到它对胆固醇含量的影响,坏脂肪会提高LDL含量,低密度脂蛋白含量,这是对身体不好的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选