一号净空道，是跑道起飞端以外，不含任何刚体障碍物的区域。在计算起飞重量时该区域可作为可用起飞距离。
CLEARWAY 1, an area beyond the takeoff end of the runway which is clear of all non-frangible objects which may be used as takeoff distance available when calculating a takeoff weight.
跑道两端，可用作在中断起飞时飞机减速的延伸地带。
An extension beyond the end of the runway which may be used to decelerate the airplane in case of an aborted takeoff.
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