sensor

/ˈsɛnsər/

any device that receives a signal or stimulus (as heat or pressure or light or motion etc.) and responds to it in a distinctive manner

中文释义：传感器；感应器

The motion sensor automatically turns on the lights when someone enters the room.

当有人进入房间时，运动传感器会自动打开灯。

Modern cars are equipped with multiple sensors to monitor engine performance.

现代汽车配备了多个传感器来监测发动机性能。