【Key words】 Urbanization Characteristics； Lag Phenomenon； Lag Causes； Binary System； Market Players；
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The expansion of city scale is one of characteristics of urbanization.
城市规模的扩张是城市化主要的外在表现形式之一。
This article analyzes systematically the world urbanization 's proceeding, characteristics since1950as well as the development trend in the next30years.
本文系统分析了自1950年以来，世界人口城市化的进程、特点及未来30年的发展趋势。
This paper analyzed the influence of urbanization on forestry, and discussed the characteristics of urban forestry and the difference between urban forestry and traditionary forestry.
为此，分析了城市化对林业的影响，并探讨了城市林业的特征及其与传统林业的区别。
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