It didn't look at shoe heel height, it looked at anatomical heel length, the distance from the back of your ankle joint to the insertion of the Achilles tendon.
他没有着眼于鞋子的高度，他考虑的是脚后跟长度的结构，从踝关节背面到跟腱的附着距离。
3
A float collar is placed at the top of the float joint and a float shoe placed at the bottom to prevent reverse flow of cement back into the casing after placement.