In the circle of mountaineering, there is such a saying: What makes the skier give up in deed is not the distant cloud-kissing peak, but often is the grain of sandstone in his shoe.

登山界有这样的说法：真正导致滑雪者放弃的不是远方高耸入云的山峰，而往往是鞋里的一粒砂石。

youdao

Abstract: this paper points at that the resultant braking force point of drum brake is on the base circle and finds the relation between the structural parameters of shoe block and moment of force.

文摘：该文阐明制动力的合力点在基本圆上，并找出蹄块结构参数与制动力矩之间的关系。

youdao

There, as a schoolboy, he had encountered a sign that featured a shoe with a spiky heel in the middle of a red circle with a diagonal slash.

NEWYORKER: Sole Mate