video detector

例句：

1. 1. The video detector picked up a signal from the other side of the room.
   视频探测器从房间的另一边捕捉到了一个信号。
2. 2. The video detector was used to detect intruders in the building.
   视频探测器被用来检测大楼内的入侵者。
3. 3. The video detector helped us to identify the suspects in the case.
   视频探测器帮助我们识别了案件中的嫌疑人。