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.
建议供应商演示一下如何用它们的技术创建小型、中型和大型的表单，这也许是明智的做法。
It may be wise to suggest that vendors demonstrate how they would create small, medium, and large forms with their technology.
较好的经验法则是：一个中型或大型城市将可能需要一个全职的协调人，而小型城市一个兼职的协调人或许就能正常运作。
A good rule of thumb is that a medium-sized or large city will probably require a full-time coordinator, while a town may be able to get by with a part-time coordinator.
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