radar returns

例句：

1. 1.The pilot used a radar to detect the enemy's position.
   飞行员使用雷达来探测敌人的方位。
2. 2.The ship's radar returned with an emergency signal.
   那艘船的雷达发出了紧急信号。
3. 3. The search team was able to track the lost plane by using the radar returns.
   搜索队通过雷达回波找到了失事飞机。