英语词汇“plumb line”是什么意思，“plumb line”的读音、用法及例句翻译-烛光网

词汇	plumb line
释义	plumb linen.（名词） A line from which a weight is suspended to determine verticality or depth.铅垂线；垂直线：悬挂一重物来测定垂直度或深度的一根线 A line regarded as directed exactly toward the earth's center of gravity.重力线：被认为是准确地指向地球引力中心的一条线
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