这些优势使大都市区成为美国经济增长的发动机。

The competitive advantages make metro areas the engines of U. S. economic growth.

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大都市区是一个国家和地区经济发达的城市化区域。

Metropolitan area (MA) is an urbanized region of an economically developed country and region.

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结果表明：太原大都市区发育尚处于初期阶段，无论人口、经济集聚水平还是城市化进程与我国发达地区同类城市都市区相比仍有较大差距。

The study reveals that the Taiyuan metropolis is still in elementary stage and that there are rather gaps in population scale, in level of economic agglomeration and in urbanization.

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