The ability to divert water into small agricultural plots meant that the Hohokam could live in large agricultural communities of relatively high population density.

将水引到小块农业用地的能力意味着霍霍坎人可以以相对高密度人口进行大规模的农业生活。

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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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Oil is found in relatively few places, and its energy density, pumpability and ease of use in internal-combustion engines makes it particularly well suited as a transportation fuel.

储有石油的地方相对较少，因其能量密度、泵送能力及在内燃机上的易用性使其特别适宜成为运输燃料。

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This melt water has a relatively low density, so it accumulates in the top layer of the ocean.

BBC: Melt may explain Antarctica's sea ice expansion

There are plenty of areas of San Francisco that are relatively low-density, but it is ridiculously hard to develop or redevelop anything.

FORBES: Are Technology Startups Ruining San Francisco?

Oil is found in relatively few places, and its energy density, pumpability and ease of use in internal-combustion engines makes it particularly well suited as a transportation fuel.

ECONOMIST: Unconventional gas