双单倍期纲 Dihaplophasea
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我曾经提到过一个有趣的事实是关于低迷期，也就是失业率双倍增加的时期，穿越国界也穿越人口群体，几乎成为一个定律。
I've mentioned before that one interesting fact about the downturn is that unemployment rates have doubled, across the country and across demographic groups, almost as a rule.
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