clear key switch

例句：

1. 1.The car's engine is running smoothly with the clear key switch.
   汽车的引擎运行得很顺畅，有清晰的按键开关。
2. 2.The new alarm clock has a clear key switch that makes it easy to set the time.
   新款闹钟有一个清晰的按键开关，使得设置时间变得很容易。
3. 3. The old radio had a clear key switch, which made it easy for people to adjust the volume.
   旧收音机有一个清晰的按键开关，这使得人们很容易调整音量。