机场是航空运输系统的一个组成部分，是民航一切活动的中心，是民航系统结构最复杂的子系统。
The airport is a part of the whole civil aviation transportation system, it is the operation center of the civil aviation, and the most complicated subsystem of the whole system.
机场是航空运输系统的一个组成部分，是民航一切活动的中心，是民航系统结构最复杂的子系统。
The airport is a part of the whole civil aviation transportation system, it is the operation center of the civil aviation, and the most complicated subsystem of the whole system.
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