- a string with a metal weight at one end that, when suspended, points directly towards the earth's centre of gravity and so is used to determine verticality, the depth of water, etc
| 单词 | plumb line |
| 释义 | WordReference Random House Unabridged Dictionary of American English © 2024 plumb′ line′,
Collins Concise English Dictionary © HarperCollins Publishers:: plumb line n
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