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单词 plumb line
释义 plumb lineBrE /ˈplʌm laɪn/NAmE /ˈplʌm laɪn/ nouna 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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