It takes place at urban fringes, and the building actions are the radical cause of its forming.
城市更需要水土保持，城市水土流失主要发生在城市边缘区，其产生的根本原因是建设活动。
To precisely understand the concept and the attributes of urban fringes is the basis of the study.
准确把握大城市边缘区的概念与本质特征是问题研究的基础。
"Urban village" is heterogeneous physical environment, which gradually formed in many urban fringes in China since the beginning of 90 s.
“城中村”是自90年代初期，在我国大中城市的建成区和边缘区形成的一类异质于现代城市和传统乡村的聚居区。
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