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.
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。
Accurate reconstruction of planar contour mixed with straight lines and arcs is achieved with position or tangent continuity.
解决了由直线和圆弧构成的平面轮廓精确重构问题，满足轮廓各段之间位置连续以及相切条件。
The wedge angle bisector gives as intersection with the cutting edge profile point pint. (3) Draw a circle that intersects point pint and is tangent to both straight fitting lines.
这楔角的等分线给作为路口停止切割边缘轮廓点品脱的啤酒。 （3）画一个圆订交点，两品脱和相切直线拟合直线。
The wedge angle bisector gives as intersection with the cutting edge profile point pint. (3) Draw a circle that intersects point pint and is tangent to both straight fitting lines.
这楔角的等分线给作为路口停止切割边缘轮廓点品脱的啤酒。 （3）画一个圆订交点，两品脱和相切直线拟合直线。
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