plumb line
noun /ˈplʌm laɪn/
/ˈplʌm laɪn/
- 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
| 词汇 | plumb line |
| 释义 | plumb linenoun /ˈplʌm laɪn/ /ˈplʌm laɪn/
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