The shape of cross-section is an ellipse folded in half through one symmetry axis, and the axis keeps perpendicular with pinacoid-view.
断面形状为沿
折的椭圆，此始终垂直于截面，其方向与平面图上的流
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.
断面形状为沿折的椭圆，此始终垂直于截面，其方向与平面图上的流中线无关。
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