每个单位的率
Rate per unit
以上为机器翻译结果,长、整句建议使用 人工翻译 。
通过除去移民因素,合并人口较少的县,他们把美国的3141个县分为了2068个“县级单位”;再调查每个县的死亡率。
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”.
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