| 单词 | 近程 |
| 释义 | 〔mortar〕A portable, muzzleloading cannon used to fire shells at low velocities, short ranges, and high trajectories. Also called trench mortar 迫击炮：-种可移动的、前装式的大炮，用来发射较低速度、近程和高弧形行程的炮弹 也作 trench mortar〔shoran〕A relatively short-range navigation system by which a ship or an aircraft can determine its position with high precision by measuring the times required for a radar signal to reach and return from each of two ground stations of known position.近程导航系统：一种相对短程的导航系统，利用该系统一艘船或一架飞机可以极其精确地测定自己所处的位置，通过测定雷达信号到达两个位置已知的地面接收站中的每一个站并返回所需的时间来实现 |
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