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在 20 世纪下半叶中国 的 ________________人口( 15-64 岁 ) 面临 着 爆炸性 增长 , 从 1952 年 的 3.5 亿 增长 到 1982 年 的 6.24 亿 , 然后 是 2000 年 的 8.9 亿。
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