40 Airplane flight instruction 飞机飞行指令 823 Amateur youth sports services, namely, organizing and providing youth sports activities 业余青年体育服务，即组织和...
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一种是飞行数据记录器，记录发送到飞机电子系统上的指令；
The first, a flight data recorder, makes a record of instructions sent to a plane's electronic systems;
末端区域4D导引应首先生成轨迹，然后生成沿该轨迹飞行的高度剖面、合理的速度剖面，最后生成自动引导飞机在规定时间着陆的4D导引指令。
To generate and realize 4D guidance in the terminal area, first there should be ground track , then the altitude profile and appropriate speed profile along the track.
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