相切的英文：
tangency

參考例句：
  • A straight line tangent to a curve
    與曲線相切的直線
  • tangent circles
    相切圓,兩個相切的圓
  • Lines which are everywhere tangential to the direction of the flow of electric current are called streamlines
    處處均與電流方向相切的曲線稱為流線。
  • A contact, as between two curves or surfaces, at three or more common points.
    密切兩段弧線或兩個平面在三個或更多公共點處的相切
tangency是什么意思：
n. 接觸

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