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plumb line的英文翻译是什么意思，词典释义与在线翻译：
英英释义
Noun:
-
a cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point
plumb line的用法和样例：
例句
用作名词 (n.)
- The plumB line is always perpendicular to the horizontal plane.
铅垂线总是垂直于水平面的。
