In January 2020 World Athletics, the governing body of international athletics, passed new rules limiting the thickness of a road shoe's sole to 40mm.

2020年1月，国际田径管理机构世界田联通过了新规定，将路用鞋的鞋底厚度限制在40毫米。

It has a bottom, of course, what we would call the sole of the shoe, " sole" is the whole bottom of the shoe, but it doesn't have a top.

它有底，当然就是我们所说的鞋底，“鞋底” 就是鞋的整个底部， 但是它没有鞋底。