Ren kou ren kou zeng zhang Ren kou zeng zhang Ren kou wen ti yu jing ji cheng zhang/ Guo min jing ji zeng zhang Cheng shi shi du ren kou rong liang/ Cheng shi shi du ren kou rong liang : Jing ji zeng zhang Zhong guo ren kou nian jian/ Ji qi ren kong zhi Ren kou xue- kao shi da gang