名词
中文翻译：深度信号标记
同义词：
['depth signal', 'depth mark例句：1. The engineer used a depth signal mark to indicate the depth of the hole.（工程师使用一个深度信号标记来指示孔的深度。）2. During the construction', 'we marked the depth signal marks on the wall.（在施工期间，我们在墙上标记了深度信号标记。）']
例句：
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1. The engineer used a depth signal mark to indicate the depth of the hole.
工程师使用一个深度信号标记来指示孔的深度。
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2. During the construction, we marked the depth signal marks on the wall.
在施工期间，我们在墙上标记了深度信号标记。
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3.The surveyor used a depth signal mark to measure the distance between two points.
测量师使用一个深度信号标记来测量两点之间的距离。