1.Once it's popped open, your cootie catcher will look like Picture 10.

1.现在把东南西北这样对折，打的小正方形。

2.The shape of cross-section is an ellipse folded in half through one symmetry axis, and the axis keeps perpendicular with pinacoid-view.

2.断形为沿对称轴对折的，对称轴始终垂直于轴截，其方向与平图的流道中线无关。