城市群是不同城市在一定空间内有机联动、优势互补从而一体化的结果。国外城市群大多经历了数十年的发展,在很多方面已趋于成熟,成为影响整个国家乃至全球的经济力量。美国大西洋沿岸城市群,是世界上首个被认可的城市群。它以纽约为中心城市,从北向南跨越10个州,由波士顿、纽约、费城、巴尔的摩、华盛顿和40多个中小城市组成,几乎囊括美国东北部所有大城市以及部分南部城市。该区面积 The urban agglomeration is the result of the organic integration of different cities in a certain space and their complementary advantages. Most foreign urban agglomerations have undergone decades of development and have matured in many aspects and become economic forces that affect the entire country and the world at large. The American Atlantic City Cluster is the first city group in the world to be recognized. It is a New York-centered city that spans 10 states from north to south and consists of Boston, New York, Philadelphia, Baltimore, Washington and more than 40 small and medium-sized cities covering almost all major cities in the northeastern United States and some southern cities. The area