就是不指定绝对坐标，仅相对当前坐标移动一定距离

先get它坐标点，再+上你要移动的位置

sp.MouseClick(sp.GetCurrentMousePoint(), MouseButtons.Right, true, true);
sp.MouseClick(new Point(sp.GetCurrentMousePoint().X+20,sp.GetCurrentMousePoint().Y+80), MouseButtons.Left, true, true);