城市群体空间是经济和城市自然演化的必然结果。
City groups are the inevitable result of natural evolution of economy and cities.
在中国，旅游热也由城市观光旅游逐渐演化为生态旅游。
In China, the tourism heat has also made a shift from city sightseeing to ecotourism.
在都市圈的演化过程中，中心城市起着非常重要的作用。
The central city plays an important part during the evolution process of metropolitan circle.
在都市圈的演化过程中，中心城市起着非常重要的作用。
The central city plays an important part during the evolution process of metropolitan circle.
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