名词
中文翻译：Unknown
同义词：
['plumb line', 'plumb plane', 'plumb bob']
例句：
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1. The engineer used a plumb bob to measure the height of the building.
工程师用铅垂线测了建筑物的高度。
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2. The construction crew used a plumb line to level the foundation.
建筑工人用铅垂线来平整地基。
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3. The surveyor used a plumb bob to determine the exact location of the building's center.
测量师用铅垂线来确定建筑物中心的具体位置。