它们分别大致相当于小型市政机场、中型都市机场和大型都市机场，并包含一套日益严格的规章制度。
They correspond roughly to small municipal, medium-sized metropolitan and major metropolitan airports respectively, and encompass an increasingly rigorous set of regulations.
在繁华的都市中心有一个巨大的运输中心，公车，火车，高速公路分别集中在不同层，机场被放置在顶层。
At the very center was a huge transportation center on different levels that would include depots for buses and trains, as well as highway and an airport at the top.
发掘大都会观念的能力，使大都市区域内的多个机场的跑道得到最佳利用，以此作为减少空中交通拥堵和延误的一个手段。
The ability to exploit metroplex concepts that enable optimal use of runways at multiple airports within metropolitan areas, as a means of reducing air traffic congestion and delays.
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