life,just like a circle.If,along the centerline,has been proceeding walk,go all the way;
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To figure out how much yarn you need to cut for the first layer, just hold it on top of the circle, spread it out like a fan and see if there are any hollow areas.
算好第一层所需的毛线，将其固定在圆上，散开成扇形，并查看是否存在空白区域。
A new Design Preview window displays the circle you just modified to look more like a sphere, as shown next.
一个设计预览窗口打开，显示你刚才修改的圆看上去更像一个球。
Let's say that we want to find the area of an ellipse with semi-axes a and b. OK, so that means an ellipse is just like a squished circle.
现在需要计算一个以a，b为半轴的椭圆的面积,其实椭圆就是一个被压扁的圆。
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