《宋书·列传·卷六十七》
他每次登山都穿上木鞋，上山时便去掉前面的鞋齿，下山时则去掉后面的鞋齿。
登蹑常著木履，上山则去前齿，下山去其后齿。
Every time he went hiking, he put on wooden shoes, and when going uphill, he would take off the teeth on the front of his shoes, and when going downhill, he would take off the teeth on the back of his shoes.