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原因是显而易见的：美国的人口老龄化意味着更多工作机会。
The reason is obvious: the graying of America means jobs.
youdao
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人口变化是劳动力老龄化的又一原因。
Demographic change is another reason why the workforce is greying.
youdao
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人口变化是劳动力老龄化的又一原因。
Demographic change is another reason why the workforce is greying.
youdao