switch indicator

例句：

1. 1. The new car has a switch indicator that lights up when you turn it on.
   新车有一个开关指示器，当你打开它时会亮起。
2. 2. The engineer used the switch indicator to troubleshoot the problem.
   工程师使用开关指示器来诊断问题。
3. 3. The switch indicator on the remote control is easy to use and very intuitive.
   遥控器上的开关指示器易于使用且非常直观。