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。
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。
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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