The fast metropolitanization also brings some urban problems at the same time.

同时，大都市区化的快速进行也产生了一些城市问题。

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With the metropolitanization in US in the early 20~(th) century, Megalopolis represented typically by the Northeast seaboard Megalopolitan area in US emerged.

20世纪初期美国大都市区化完成后，随即出现了以东北部大都市带为典型代表的大都市带。

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With the metropolitanization in US in the early 20~(th) century, Megalopolis represented typically by the Northeast seaboard Megalopolitan area in US emerged.

20世纪初期美国大都市区化完成后，随即出现了以东北部大都市带为典型代表的大都市带。

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