a study based on the case of Chengdu a study based on Chinese practice a study based on the Chinese tripitaka a study based on the pearl river delta a study based on the life history approach a study based on the practice of Guangdong Province a study on the image of Guangzhou a study based on word association 城乡教育一体化水平监测与评价研究：以成都市为例：a study based on the case of Chengdu a study based on the uncertainty of medical expenditure