历史学
贫困化
Their education level was very low, and they only did some low-paid job, this had caused pauperization of their life.
他们的受教育程度很低,基本都从事一些低回报或临时性的工作,这造成了他们生活的贫困化。
经济学
生物学
杂种弱势
杂交弱势
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