spark telegraphy

例句：

1. 1. Spark telegraphy is a method of transmitting information through the use of sparks.
   火花电报术是一种通过使用火花来传输信息的方法。
2. 2.In the early days of telephone communication, spark telegraphy was used to transmit signals over long distances.
   在电话通信的早期阶段，火花电报术被用来在长距离上传输信号。
3. 3. The invention of spark telegraphy revolutionized the way we communicated and made it possible for people to connect across vast distances.
   火花电报术的发明使通讯方式发生了革命，使得人们能够跨越广阔的距离进行沟通。