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来源:雅诚德英语网
They looked at death rates by county, having corrected for migration and merged sparsely populated ones so that America's 3,141 counties became 2,068 "county units".
他们在每个县调查死亡率,除去移民和新出现的人口稀少的地区,美国由3141个县变成2068个。
They looked at death rates by county, having corrected for migration and merged sparsely populated ones so that America's 3,141 counties became 2,068 "county units".
他们在每个县调查死亡率,除去移民和新出现的人口稀少的地区,美国由3141个县变成2068个。