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词汇 plumb line
释义 plumb linen.(名词)
    1. 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
    1. 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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