"China" . . "China's population: too much or too old" . "Zhong guo ren kou : tai duo hai shi tai lao" . . . . . "当代中国人口数量与人口结构问题" . "Dang dai Zhongguo ren kou shu liang yu ren kou jie gou wen ti" . "China's population, too much or too old" . "Zhongguo ren kou, tai duo hai shi tai lao : dang dai Zhongguo ren kou shu liang yu ren kou jie gou wen ti" . "中国人口, 太多还是太老 : 当代中国人口数量与人口结构问题" . . "中国人口:太多还是太老" . "Zhongguo ren kou, tai duo hai shi tai lao dang dai Zhongguo ren kou shu liang yu ren kou jie gou wen ti" . . . . . . . .