短語(yǔ)詞組短語(yǔ)optimize the demographic structure 優(yōu)化人口結(jié)構(gòu)social and demographic structure 社會(huì)與人口結(jié)構(gòu)rural demographic structure 農(nóng)村人口結(jié)構(gòu) 返回 demographic structure