three step switch

例句：

1. 1. The three-step switch on the door is a safety feature.
   门上的三步开关是一个安全特性。
2. 2.The new three-step switch has improved battery life.
   新的三步开关提高了电池寿命。
3. 3. The three-step switch allows for easy adjustment of the volume.
   三步开关使得音量调整变得简单。