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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First, most underdeveloped countries have only inadequate surveys of their natural resources.

第一，大多数不发达国家对其自然资源只作了不充分的勘探。

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The Washington, DC-based nonprofit Population Reference Bureau projects that, by 2050, 70 percent of the world will inhabit cities, with most of this growth occurring in underdeveloped countries whose limited resources may exacerbate an already difficult situation.

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