The shape of cross-section is an ellipse folded in half through one symmetry axis, and the axis keeps perpendicular with pinacoid-view.
状为沿对称轴对折的椭圆，此对称轴始终垂直于轴截，
方向与平图上的流
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.
状为沿对称轴对折的椭圆，此对称轴始终垂直于轴截，方向与平图上的流中线无关。
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，
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