telegraph grade circuit

例句：

1. 1.The telegraph was invented in the 1800s to transmit messages quickly.
   电报在19世纪被发明出来以快速传输消息。
2. 2. She sent a telegram to her friend asking for help.
   她给朋友发了一封电报请求帮助。
3. 3. The telegraph line connected the two cities, allowing them to communicate instantly.
   电话线将两个城市连接起来，使他们能够立即通信。