PT：相切点

“Point of Tangency”常被简写为PT，这种缩写形式便于快速书写和使用，尤其在学术与科学领域中应用广泛。作为几何学中的一个基础概念，它特指曲线与直线或两个曲线恰好接触于一点的几何位置，中文译为“相切点”。

Based on the analysis, determine the unicity of point of tangency and point of intersection.
基于在解析几何的基础上确定了切线和交点的唯一性。
This paper studied the case that there is a known point of tangency of a circle and a parabola while the center of the circle is on the recession of the parabola.
应用数形结合的方法，研究了已知圆与抛物线有一个切点，而圆心在切点处抛物线的凹向的情形。
Their point of tangency is called the pitch point, and since it lies on the line of centers, it is the only point at which the tooth profiles have pure rolling contact.
大小齿轮的接触点称为节点，由于节点位于中心线上，因此节点是齿形轮廓线上唯一做纯滚动接触的点。
The paper takes teaching environment as point of tangency, gives an thorough analysis on the constructing element of teaching environment and educational equipment as well as their mutual relations.
教育技术装备是教育体系中不可或缺的重要组成部分，是发展大教育的要素之一，也是推动教育信息化的重要力量。
This is just as point of tangency of this dissertation.
这正是本研究的切入点。

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