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plumb line的英文翻譯是什麼意思，詞典釋義與在線翻譯：
英英釋義
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的用法和樣例：
例句
用作名詞 (n.)
- The plumB line is always perpendicular to the horizontal plane.
鉛垂線總是垂直於水平面的。
