爬上一座小山后，饱览蓝色的大海、白色的建筑和绿色的橄榄树，我停下来喘口气，然后摆好姿势，拍下这幅全景图的最佳照片。
After climbing up a hill for a panoramic view of the blue sea, white buildings and green olive trees, I paused to catch my breath and then positioned myself to take the best photo of this panorama.
就像我们看见的，白色得条带与音量图重叠了，所以我们需要用蒙版将其部分隐藏，只留下左上端可见。
As we can see, the trail is overlapping the white volume, so we need a mask to hide part of it. Leave only the top-left section visible.
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.
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