首先，图像以频率坐标轴的中线为轴对称。
First of all, note that the graph is symmetric with respect to midline of the frequency axis.
考虑伞衣中线上的子午向应力，得到了一个双轴应力模型。
The meridional stress in the gore centerline is considered, and a biaxial stress model is got.
断面形状为沿对称轴对折的椭圆，此对称轴始终垂直于轴截面，其方向与平面图上的流道中线无关。
The shape of cross-section is an ellipse folded in half through one symmetry axis, and the axis keeps perpendicular with pinacoid-view.
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