This popular summer squash is shaped like a slightly curvedcylinder, a bit smaller at the top than the bottom.
这种夏季流行南瓜形状是稍微弯曲的圆筒状，顶部比底部稍微小一些。
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The mathematical model of bending logs of curved elliptical cylinder is analysed with the elliptical-archimedes spiral envelope in cylindric coordinate.
本文采用柱坐标，以椭圆—阿基米德螺线包络组成解析曲线椭圆柱体的弯曲原木的数学模型。
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And the curved surface formula of smooth link between twisting curved surface and cylinder surface can be obtained.