名词
中文翻译：指示器
同义词：
['depth indicator', 'depth gauge', 'depth meter']
例句：
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1. The depth indicatoron the diving mask is very useful for measuring underwater depth.
潜水镜上的深度指示器对于测量水下深度非常有用。
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2.The engineer used a depth gauge to check the water level before starting the construction work.
工程师使用测深仪来检查水位，以便开始施工工作。
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3. The depth meter was used to measure the depth of the ocean floor during the research expedition.
在研究探险中，使用测深仪测量了海洋底部的深度。