1. navigation without the aid of celestial observations. 
   没有辅助太空观测资料的航行。
2. air navigation aid and telecommunication facilities on the airport 
   飞机场通讯导航设施
3. a well equipped playground; a ship equipped with every mechanical aid to navigation. 
   装备完善的运动场；装有所有帮助航行的机械的船只。
4. A tall structure topped by a powerful light used as a beacon or signal to aid marine navigation. 
   灯塔上面装有大功率照明灯的一种高建筑，用作指示海上航行的信标或标志
5. An instrument based on the principle of the sextant but employing only a45= angle, used as an aid in navigation. 
   八分仪以六分仪的规则为基础设计的一种仪器，但只采用45°角，用来帮助航海

查看更多例句 相关情景会话

• 1. “奇异”无线电导航系统
  free military aid 无偿军事援助...gee navigation aid “奇异”无线电导航系统...grinding aid 助磨剂, 磨料
  www.lhhy.cn - 相关搜索