相切的英文：
tangency

参考例句：
  • A straight line tangent to a curve
    与曲线相切的直线
  • tangent circles
    相切圆,两个相切的圆
  • Lines which are everywhere tangential to the direction of the flow of electric current are called streamlines
    处处均与电流方向相切的曲线称为流线。
  • A contact, as between two curves or surfaces, at three or more common points.
    密切两段弧线或两个平面在三个或更多公共点处的相切
tangency是什么意思：
n. 接触

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