back diagonal pass 斜线后传 ; 斜线回传
left diagonal back 左后 ; 左后方
right diagonal back 右后 ; 右后方
diagonal back straps 交叉背带
Subdivide the diagonal section at the back-left side of the triangle with one diagonal-back parting.
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。
That move along the unit circle to the diagonal, and then I move back to the origin in a straight line.
然后沿单位圆的圆弧走到对角线处，接着这直线回到原点。
So, the third guy is when we come back to the origin along the diagonal.
第三部分沿对角线回到原点。
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