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- 問題詳情：Brazilhasbecomeoneofthedevelopingworld'sgreatsuccessesatreducingpopulationgrowthbutmorebyaccidentthandesign．WhilecountriessuchasIndiahavemadejointeffortstoreducebirthrates,Brazilhadbetterresultswithoutreallytrying,saysGeorgeMartineatHarvard．Br...
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