单词：plumb-line
plumb-line的用法和样例：
例句
- The plumB line is always perpendicular to the horizontal plane.铅垂线总是垂直于水平面的。
词汇搭配
- plumb line铅垂线
- curvature of the plumb line垂线曲率
- plumb line deflection垂线偏差
- deflection of plumb line垂线偏差
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