RAD

例句：

1. 1. The pilot used a radar to detect the enemy planes.
   飞行员使用雷达探测敌机。
2. 2.The radar operator monitored the weather conditions in the area.
   雷达操作员监测该地区的天气条件。
3. 3. The military had installed several new radar systems to improve surveillance capabilities.
   军方安装了新的雷达系统，以提高监视能力。