用最明显的图形来描述这个过渡的特性就是：当在两个圆之间绘制一条直线，直线与每个圆只有一个交点时，那么这条线就是两个圆的切线。
The quality of this transition is best visualized by a straight line drawn between two circles: the line's only point of contact with each circle is tangential.
切线是一条直线，刚好接触到曲线，所以跑切线是从一个弯道跑到另一个最短的距离。
A tangent is a straight line that just touches a curve, so the concept of "running the tangents" is to run the shortest distance possible by running straight from one curve to the next.
将与曲线拐点切线和最大值水平直线交点相对应的长径比值定义为纤维临界长径比，将与此相对应的函数值定义为弹性模量临界值。
The critical aspect ratio of the fiber is defined as the crosspoint of the tangent value of the inflexion and the asymptote of the maximum elastic modulus.
在不规则样条的负荷-挠度取拐点后直线段切线与横坐标的交点作零点修正后所测得的弯曲弹性模量比较接近真实值。
Drawing a tangent after inflection and intersected the abscissa the slope of the tangent was taken as the flexile modulus.
摆线逆运动中与动切线成定角的直线，其包络也是圆周渐开线。
The envelope of moving line on the hypocycloid plane may be an epicycloid or cardioid and the…
摆线逆运动中与动切线成定角的直线，其包络也是圆周渐开线。
The envelope of moving line on the hypocycloid plane may be an epicycloid or cardioid and the…
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