名词
中文翻译：声纳
同义词：
['sounder', 'sonar']
例句：
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1. The sonar system detected the underwater object at once.
声纳系统立刻探测到了水下物体。
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2. The sonar was used to map out the ocean floor.
声纳被用来绘制海洋底部地图。
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3. The sonar operator carefully monitored the depth of the water.
声纳操作员仔细监测了水的深度。