The actual level of intensity depends on such factors as the physical layout, population density, and productive activities of a metropolis.
实际的强度水平取决于诸如大城市的物理布局、人口密度和生产活动之类的因素。
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"In the general population today, at this genetic, environmental level, we've pretty much gone as far as we can go," says anthropologist William Cameron Chumlea of Wright State University.