Centerwall also found that in South Africa, where television was not generally available until 1975, national murder rates started rising about a decade later.
森特沃尔还发现，南非直到1975年才普及电视，而全国谋杀发生率在约10年以后开始上升。
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Studies by Brandon Centerwall, an epidemiologist at the University of Wisconsin, have shown that the post war murder rise in the United States began roughly a decade after TV viewing became common.