美国的空域分为21个区域（管制中心），每一个区域都划分为多个扇区。
The United States airspace is divided into 21 zones (centers), and each zone is divided into sectors.
美国的空域分为21个区域（管制中心），每一个区域都划分为多个扇区。
The United States airspace is divided into 21 zones ( centers ) , and each zone is divided into sectors.
每个航线管理中心负责本区域内除枢纽雷达管制区和地方机场领空外的所有分区的空中交通管制。
Each ARTCC manages traffic within all sectors of its center except for TRACON airspace and local-airport airspace.
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