求翻译：图4给出了由参数 决定的刀位处的误差分布曲线，横坐标 代表这些采样点对应的环心圆圆心角参数，纵坐标 代表了相应的加工误差，曲线上纵坐标为零（即 ）的两个点代表了圆环面刀具和 之间的两个切触点，整个误差分布呈现出多点切触加工特有的“W”形状。是什么意思？

Figure 4 shows a knife at determined by the parameter error distribution curve, the abscissa represents round Angular parameters of these sampling points corresponding to the ring center, the vertical axis represents the processing error, the curve on the vertical axis is zero (ie) two points on beh

Figure 4 shows the parameters determined by the position of the error distribution curve, abscissa on behalf of these sampling points of the corresponding central angle parameters and sparkling heart, and the ordinate represents the processing errors, on the curve is zero (i.e. , vertical axis) at t

Figure 4 gave by the parameter decision knife position error distribution curve, the x-coordinate has represented these sampling point correspondence the crown of arch round center of circle angle parameter, the y-coordinate has represented the corresponding processing error, in the curve the y-coor

Figure 4 to out has by parameter decided of knife bit Department of errors distribution curve, horizontal representative these sampling points corresponds to of ring heart round circle angle parameter, ordinate representative has corresponding of processing errors, curve Shang ordinate for zero (is)

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