Study on the mechanism of poverty in rural China study on the mechanism of ethnic stratification Study of poverty and auti-poverty in rural China Study on the new urban poverty in China 并列题名：Study of poverty and auti-poverty in rural China Research on the mechanism of rural governance in China study on Jiaozhou model of toilet renovation in rural China study on the transfer of rural labor in China study on the system of concealment in ancient China Study on the operation mechanism of improved breeding of sheep industry in China