Besides having a high energy density, the long chains of hydrocarbons are also good building blocks for constructing more complex molecules, such as plastics and pharmaceutical drugs.

除含有高能量外，长链碳氢化合物也适合构建更复杂的分子，如塑料和药品。

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And, depending upon, say the density of the gas or the liquid, the size of the molecules, they change parameters in the simulation, how far it, say, goes in each unit time and things like that.

这还取决于，比方说，液体或气体的密度，分子的大小，它们改变了模拟程序中的参数，它们在一个时间单元内运行的距离，或者之类的。

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In the massive eclogites, the garnets with low dislocation density and with no visible clusters of water molecules are mainly rigid although a few dislocation nets have been observed.

块状榴辉岩中石榴石的位错密度低，没有观察到水分子团，虽然在局部发现有位错网，但总体上仍呈刚性。

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The density of water molecules within the leaf is typically 60 times greater than the density of carbon dioxide in the air, and the diffusion rate of the water molecule is greater than that of the carbon-dioxide molecule.

WSJ: Harrison H. Schmitt and William Happer: In Defense of Carbon Dioxide

Instead of being stored in batteries, the electricity made by solar panels can be used to split water into oxygen and hydrogen molecules, the latter of which can be used as a fuel with high energy density.

WHITEHOUSE: Engage and Connect