household size
平均住户人数 mean household size
·2,447,543篇论文数据，部分数据来源于NoteExpress
在三年时间，美国三大城市总共有几乎1/10的黑人住户消失，而在美国其他地方，黑人数量一直比较稳定。
In five years America's three biggest cities lost almost a tenth of their black residents, while elsewhere in America their numbers held steady.
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