右极限就是函数从一个点的右侧无限靠近该点时所取到的极限值，且误差可以小到我们任意指定的程度，只需要变量从坐标充分靠近于该点。 函数在一点处极限存在时，函数在此处的左极限和右极限均存在，且左右极限相等。
由一错例引出了讨论导函数在分段点处的左、右极限与对应函数的左、右导数相等的分段函数在分段点处导数的一种求法。
A false example is given to educe the discussion of a solution to the derivative of subsection function at the point of subsection.
因为我是一个坏人，所以我们班长左看右看横看竖看都觉的我不顺眼，没事总是要找找我的毛病，不过人的忍耐是有极限的。
Because I was a baddy, so our monitor was offensive to the eye with me all the time, and always nicked me, my patience was limited.
并讨论说明了导函数的右(左)极限与右(左)导数之间的关系。
And demonstrates the relations between the right (left) limit of function and right (left) derivative.
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