单词	plumb line
释义	plumb line noun A line with a plumb attached to it, used for finding the depth of water or determining the vertical on an upright surface.We did scramble out on one permanent pond with a view to testing the depth with a plumb line which was probably quite dangerous but you don't think of that at that age.... Draw a plumb line on the wall representing one side of the cabinet. There is a good chance that the corner is not plumb, so this process guarantees that you will be working from a plumb line.
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