名词
中文翻译：铅垂线
同义词：
['line', 'plumb line']
例句：
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1. The engineer used a plumb line to measure the angle of the wall.
工程师用铅垂线测量了墙的角度。
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2. The construction crew used plumb lines to level the floor.
建筑工人用铅垂线来平整地板。
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3. The carpenter used a plumb line to ensure the ceiling was perfectly straight.
木匠用铅垂线确保天花板是完美的直线。