echo depth recorder

例句：

1. 1. The echo depth recorder is used to measure the sound pressure level in a particular area.
   回声深度记录器用于测量特定区域的声压级。
2. 2. The echo depth recorder was developed to improve the accuracy of echolocation in marine animals.
   回声深度记录器被开发出来，以改进海洋动物回声定位的准确性。
3. 3. The echo depth recorder is an essential tool for scientists studying underwater environments.
   回声深度记录器是科学家研究水下环境的重要工具。