在和对角线的-背面的三角形的背面留下的边细分对角线的区段离别的。
Subdivide the diagonal section at the back-left side of the triangle with one diagonal-back parting.
把一张正方形的纸沿着对角线折成三角形，然后再对折一次。
Fold a piece of squared paper along the diagonal into a triangle, and fold into another triangle.
剪变弹簧，四边形面的对角线重合。提供抵抗布料剪切变形的力。
Shear Springs are built on the diagonals of quad faces and provide some resistance to shearing forces in the cloth.
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