independent variable depth sonar

例句：

1. 1.The independent variable is the factor that affects the outcome of the experiment.
   独立变量是影响实验结果的因素。
2. 2. The depth sonar was used to map out the underwater terrain.
   深度声纳被用来绘制海底地形图。
3. 3.The team used the depth sonar to detect any potential hazards in the area.
   团队使用深度声纳来探测该区域的潜在危险。