submarine telegraphy

例句：

1. 1. The submarine telegraphy system was used to transmit messages from the depths of the ocean.
   潜水电报系统被用来从海洋深处发送消息。
2. 2.In this new era, underwater telegraphy is becoming more and more important in military communications.
   在这个新时代，水下通信在军事通信中变得越来越重要。
3. 3. The submarine telegraphy equipment was carefully installed on the boat to ensure a smooth operation.
   潜艇通讯设备被小心地安装在船上，以确保顺利运行。