dial insulator

例句：

1. 1.The new phone has a dial insulator that makes it easy to switch between calls.
   这款新手机有一个拨号绝缘体，使得切换通话变得简单。
2. 2. The engineer used a dial insulator to connect the wires together.
   工程师使用了一个拨号绝缘体来连接电线。
3. 3. The insulator was designed to prevent electrical shocks from reaching the ground.
   绝缘体的设计是为了防止电击到达地面。