Low average population densities are characteristics of most underdeveloped countries.

平均人口密度低是大多数不发达国家的特点。

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The cultivation of crops has expanded into progressively drier regions as population densities have grown.

随着人口密度的增长，农作物的种植已经扩展到了越来越干旱的地区。

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Crown of thorns starfish normally live in high population densities.

刺冠海星通常生活在聚居的环境中。

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The most affluent, Hartford, has among the lowest urban population densities in the world.

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One remarkable similarity in all the fastest-growing areas is their relatively low population densities.

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In large parts of America, where population densities are lower, it would be much costlier.

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