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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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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