There is hierarchy relationship among cities exterior urban agglomeration, which can be constructed across administrative divisions. If administrative barriers presents, there wil be much more a lot of obstacles for constructing urban agglomerations across administrative districts and realizing coordinated development of regional economic. Concerning the issue of constructing urban agglomeration across across administration, Yangtze river delta urban agglomeration and Beijing-Tianjin-Hebei urban agglomeration are the very typical examples. The former is forming the development pattern of “cooperation of the powerful” in the vast hinterland. while the latter is forming the pattern of “developed just me”. Administrative barriers wil result in the problems excessive development in one area while lack of development wil appear in another area, regional coordinated development is one kind of Pareto improvement. Colaboration mechanism among the cities in the Yangtze river delta urban agglomeration is worthy of beijing-tianjin-hebei urban agglomeration to folow, so that the construction of of “dual core + more children” urban system can be realized as soon as possible.%城市群内的城市间存在层次关系，这种层次关系可以跨越行政区划构建。在有行政壁垒的情况下，跨越行政区划构建城市群和实现区域间协同发展就会存在很多障碍因素。在跨越行政区划构建城市群问题上，长三角城市群和京津冀城市群是非常典型的例证，前者在广大腹地形成了“群雄并起”的发展格局，而后者还是“唯我独尊”的局面。行政壁垒会使得一个区划存在“超发展”问题的同时，另外一个区划存在“欠发展”问题，区域协同发展是一种帕累托改进。长三角城市群内城市间的协作机制值得京津冀城市群效仿，以便尽快在“双核+双子”城市格局基础上实现“双核+多子”城市体系的构建，将“环京津贫困带”转化为“环京津城市带”，促进京津冀协同发展。on the basis of “dual core + dual children”， converting the “poor belt around Beijing-Tianjin-Hebei” to “urban belt around Beijing-Tianjin-Hebei”， promoting the coordinated development of Beijing-Tianjin-Hebei.
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机译：Do Regional Integration Plans Promote Joint Prevention and Control of Air Pollution? - Lessons from China’s Major City Clusters =区域一体化进程带给大气污染联防联控的契机和挑战 - 基于中国国家级城市群发展的研究
