Insects and pathogens are integral components of forest ecosystems and normally are present at a relatively low density, causing little damage, and having negligible impact on tree growth and vigour.

昆虫和病原体是森林生态系统的固有成分，通常其密度相对较低，所造成的损害较小，对树木生长及其活力的影响微乎其微。

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It ranks seventh for total energy used, however this is largely the result of the state's relatively low population density, the third lowest in the country.

在总能源消耗方面排名第七，这绝大方面取决于该州作为该国人口数第三低相对人口密度。

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Coal from this region is low in sulphur, and so burns more cleanly, but has a relatively low energy density unless treated.

该区域的煤含硫量低，也因此更为清洁，但是在处理前能值(energy density)相对较低。

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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?