signal system telegraph

例句：

1. 1. The signalsystem is designed to ensure safe and efficientcommunication between the two countries.
   该系统旨在确保两国之间安全且高效的通信。
2. 2. The telegraphwas invented by Samuel Morse in1837, revolutionizing theway people communicated over long distances.
   电报由塞缪尔·莫尔斯于1837年发明，彻底改变了人们跨越长距离进行通讯的方式。
3. 3.In the early days of telephone communication,the telegraph played a crucial role intransmitting messages quickly and efficiently.
   在电话通信的早期阶段，电报在快速而有效地传输消息方面发挥了关键作用。