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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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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It is found, theoretically, that using different number density distributions of luminescent molecules within the PC, one can probe the partial information or even all of the total DOS in the PC.

理论上研究发现，通过引入含不同密度分布的发光分子可以探测到光子晶体的全态密度的部分细节甚至全部信息。

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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