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The species' density of the gypsy moth will be controlled under economic permitted level.

终将舞毒蛾的种群密度控制在经济允许水平之下。

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This article analysis the quantitative relations between the single quality of a colony of rice plant and the density, output and economic coefficient.

本文分析了水稻群体的个体质量分别与密度、产量和经济系数之间的数量关系；

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Certainly sustained economic growth, low density and more affordable housing all clearly continue to push the center of population gravity toward certain Sun Belt cities, primarily in the Southeast and Texas.

FORBES: America's Fastest- and Slowest-Growing Cities

Opponents point out that unlike areas in other countries, mass transit is only economic viable in areas with sufficient density and that on a large scale, massive public transit programs have no chance of becoming self-sufficient.

FORBES: Which Candidate's Energy Plan is Better for America?

The risk of loss of lives and economic disaster in the southern Mediterranean is high due to strong population density along its coasts: around 150 million people concentrated in 46, 000 kms of coastline, 110 million of them living in cities bordering the sea and some 200 million tourists visiting the area every year.

UNESCO: Indigenous Peoples