名词
中文翻译：非定向声纳测深
同义词：
['non-directional sonar', 'sonar', 'sonar echo sounding']
例句：
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1.The sonar system is used to detect underwater objects.
声纳系统用于探测水下物体。
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2. The sonar operator carefully scans the ocean floor for signs of life.
声纳操作员仔细扫描海洋底部，寻找生命迹象。
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3. The sonar echo sounding helped us locate the lost submarine.
声纳回声测深帮助我们找到了失踪的潜艇。