pantograph wearing strip

例句：

1. 1.The pantograph was used to send messages over long distances.
   电报机被用来远距离发送信息。
2. 2. The telegraph operator had to operate the pantograph manually.
   电报员必须手动操作拉线机。
3. 3. The pantograph was a crucial part of the early telephone system.
   拉线机是早期电话系统的关键部分。