Even though race courses are measured accurately, many racers run a longer distance (and therefore a slower finish time) by following every curve in the road.
尽管跑步的课程都是精确的测量，许多选手跑的曲线都是较长的路程(因此以一个较慢的时间完成)。
2
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。
3
The purpose of "lactate threshold" training, then, is to move your lactate curve to the right so that you can run faster before reaching this "threshold."