转型期中产阶层消费特征：以珠江三角洲为例：a case study of the Pearl River Delta a case study of the Pearl River Delta 中国流动人口政策演化与评价：以长三角地区为例：a case study on yangtze river delta 长江三角洲城市旅游空间结构形成机制：a case study of the Yangtze River delta 中国自主品牌的基本战略：基于珠三角地区的研究：a study based on the pearl river delta 城市化进程中的农民工：来自珠江三角洲的研究：a study from the Pearl river delta area a case study of the Yangtze River delta a study based on the pearl river delta