scan-off beam

例句：

1. 1. The scan-off beam is used to detect the presence of objects in a room.
   扫描光束用于检测房间内物体的存在。
2. 2. The engineer used the scan-off beam to locate the faulty component.
   工程师使用扫描光束定位故障组件。
3. 3. The scan-off beam was used to create an image of the scene.
   扫描光束被用来创建场景的图像。