nod·al /ˈnodḷ/ 形容詞
  結的,結節的,節的
  nodal
  節點
  Nod·al a. Of the nature of, or relating to, a node; as, a nodal point.
  Nodal line, Nodal point, in a vibrating plate or cord, that line or point which remains at rest while the other parts of the body are in a state of vibration.
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