backstep

1.The backstep is most effective when the outside edge of the front of the shoe is what contacts the hold — in the vicinity of the baby toe and the next toe in from the baby toe.

当鞋尖的外侧（接近小趾和小趾旁边的脚趾那部分）踩点时，侧踩是有率的。

2.Numerical simulations of laminar flow separation and reattachment occurred in an annular backstep passage are performed by the SIMPLER algorithm.

用SIMPLER算法对流过环形后台通道内的层流分离和再附着数值模拟。