名词
中文翻译：铅垂线
同义词：
['vertical ruler', 'plumb line']
例句：
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1.The engineer used a plumb bob to measure the angle of the wall.
工程师用铅垂尺测量了墙的角度。
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2.The construction workers were using a plumb bob to level the floor.
建筑工人正在使用铅垂尺来平整地板。
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3.The surveyor used a plumb bob to check the accuracy of the building's foundation.
测量师使用铅垂尺检查建筑物基础的准确性。