County X and County Y have similar terrain, but the population density of County X is significantly higher than that of County Y.

X 县和 Y 县的地形相似，但 X 县的人口密度显著高于 Y 县。

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The researchers think they have devised a biofuel that has a 40% higher energy density than ethanol, that repels water and that can be made relatively speedily.

研究人员们认为设计出了一种比乙醇的能量密度高出40%的生物燃料，而且它排斥水并能在制造速度上相对快捷。

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Samsung expects to have more than 10 percent of its total DRAM chip production in 2012 at the 4gb (or higher) density.

据三星预计，2012年三星将有10%的内存芯片产品是基于4gb及更高容量密度的芯片。

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Supertasters typically have a higher density of fungiform papillae, mushroom-shaped projections on the tongue that contain taste buds.

WSJ: People Who Taste Too Much

Without any intervention from politicians or environmentalists societies that progress have been using m ore fuels that have less carbon with higher energy density (1 kg of wood fuels a light bulb for 1 day, 1 kg of coal fuels a light bulb for 4 days, 1 kg of crude oil for 5 days, 1kg of methane for 6 days and 1 kg of uranium for over 140 years).

FORBES: Investing in Biofuels or Biofools?

This is not to say that the higher-density enclaves of urban areas do not have an important place.

FORBES: Megacities And The Density Delusion: Why More People Doesn't Equal More Wealth