在对抛物线的研究中 ,笔者发现一个有趣性质 :定理　抛物线任意一条弦的两端点处的切线的交点与弦中点的连线平行 (或重合 )于抛物线的对称轴 ,且被抛物线平分 .该命题的题意是 :(以 y2 =2 px为例 )如图所示 ,线段 AB为抛物线 y2 =2 px的任意一条弦 ,C为线段 AB之中点 ,抛物线 In the study of parabola, the author found an interesting property: the intersection of the tangent at the two ends of any string of the theorem parabola is parallel (or coincident) with the line connecting the midpoint of the string to the axis of symmetry of the parabola, and is bisected by the parabola. The meaning of the proposition is: (taking y2 = 2 px as an example) As shown in the figure, the line AB is any string of parabola y2 = 2 px, C is the middle point of the line AB, parabola