There are two reasons. First, jobs in such places are generally less skilled.

有两个原因。第一：这些地方的工作一般缺乏技术含量。

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Knowledge workers are generally better paid than less-skilled workers.

知识型工人的工资通常比低技能工人高。

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Across the rich world, well-educated people increasingly work longer than the less-skilled.

在富裕国家，比起技能不足的人，受过良好教育的人工作时间越来越长。

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Across the rich world, well-educated people increasingly work longer than the less-skilled.

在富裕国家，比起技能不足的人，受过良好教育的人工作时间越来越长。

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