optical rangefinder

• 光学测距仪

optical rangefinder的用法和样例：

例句

1. The secondary battery has four directors, each of which has its own rangefinder and radar, and may control all or any part of the dual-purpose battery.
   副炮台共有四座指挥仪，每一座都有自己的光学测距仪及雷达，可以控管全部或部分两用炮台。