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
单词 | plumb line |
释义 | plumb linenoun /ˈplʌm laɪn/ /ˈplʌm laɪn/
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