| 词汇 | plumb line |
| 释义 | plumb lineBrE /ˈplʌm laɪn/ NAmE /ˈplʌm laɪn/ noun a piece of thick string with a weight attached to one end , used to find the depth of water or to test whether a wall , etc . is straight （测水深或垂直面用的）铅垂线，重锤线 |
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