The derivative limit theorem may draw out the left (right) derivative limit theorem and about the region end point.
导数极限定理可以引出左(右)导数极限定理、区间端点导数极限定理。
The left end represents now, and the right end represents a point in the future.
左端代表着现在，右边代表着未来的某个时刻。
The shaft end of the club should point between middle of the left thigh and the pants' zipper.
杆身应该指向左大腿的中间到裤子的拉链之间。
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