如果曲线c，起点为P0，终点为1，那么计算所做功的线积分，只与端点位置有关，而与我们选择的路径无关。
P1 If we have a curve c, from a point p0 to a point p1 then the line integral for work depends only on the end points and not on the actual path we chose.
代入t0，得到曲线的起点。
P0 When I plug t0, I will get the starting point of my curve, p0.
它们都有一个起点一个终点图中的蓝点，但二次方贝塞尔曲线只有一个红色控制点点而三次方贝塞尔曲线有两个。
A quadratic bezier curve has a start and an end point (blue dots) and just one control point (red dot) while a cubic bezier curve USES two control points.
人生好似一条曲线，起点和终点是无可选择的，而起点和终点之间充满著无数个选择的机会。
Life is like a curve, starting point and the destination are not optional, but countless opportunities are between starting point and destination.
主轴静刚度在卸载时要大于加载时，卸载时主轴系统弹性恢复迟滞，并且加载曲线与卸载曲线不封闭，卸载时主轴变形恢复不到起点，进而影响加工精度。
Spindle static stiffness unloading is more than that of loading. The elastic deformation of spindle system resumes stagnantly when unloading. So the loading curve and unloading curve are not closed.
主轴静刚度在卸载时要大于加载时，卸载时主轴系统弹性恢复迟滞，并且加载曲线与卸载曲线不封闭，卸载时主轴变形恢复不到起点，进而影响加工精度。
Spindle static stiffness unloading is more than that of loading. The elastic deformation of spindle system resumes stagnantly when unloading. So the loading curve and unloading curve are not closed.
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