piston hydrophone

例句：

1. 1.The piston hydrophone was used to detect underwater sounds.
   活塞式水听器被用来探测水下声音。
2. 2. The engineer used the piston hydrophone to monitor the water level in the reservoir.
   工程师使用活塞式水听器来监测水库的水位。
3. 3.The piston hydrophone is a critical tool for underwater exploration.
   活塞式水听器是水下探索的关键工具。