Next, the center of the pie is erased by drawing a white circle, and another arc is drawn to provide a visual border between the interior circle and the peripheral pie slices.
接下来，将绘制一个白色圆形擦掉饼图的中心，并且绘制另一条弧线来提供内部圆形与外围饼图分区之间的可视边界。
Next, the center of the pie is erased by drawing a white circle, and another arc is drawn to provide a visual border between the interior circle and the peripheral pie slices.
接下来，将绘制一个白色圆形擦掉饼图的中心，并且绘制另一条弧线来提供内部圆形与外围饼图分区之间的可视边界。
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