underwater signalling

例句：

1. 1. The submarine was equipped with advanced communication systemsto ensure effective underwater signalling.
   潜艇配备了先进的通信系统，以确保有效的水下信号传输。
2. 2. In the depths of the ocean, underwater signalling technology is crucialfor survival.
   在海洋深处，水下信号传输技术对于生存至关重要。
3. 3. The team successfully transmitted theirmessage underwater using a special device.
   该团队成功使用一种特殊的设备在水下传输了他们的信息。