名词
中文翻译：定向回声测深
同义词：
['directional sonar', 'directional echo sounding']
例句：
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1. The directional echo sounding was used to mapthe ocean floor.
定向回声测深用于绘制海洋底部地图。
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2. The directional echosounding helped us locate the lost ship.
定向回声测深帮助我们找到了失踪的船只。
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3. The directional echo sounding revealeda large underwater cave system.
定向回声测深揭示了一个庞大的水下洞穴系统。