When Watson asks how Holmes knows this, the detective answers: It is simplicity itself ... my eyes tell me that on the inside of your left shoe, just where the firelight strikes it, the leather is scored by six almost parallel cuts.
华生倍感惊奇，问福尔摩斯是怎么知道的，福尔摩斯回答： 这些事本身很简单， ...我的眼睛告诉我，在你左脚那只鞋的里侧，也就是炉火刚好照到的地方，其面上有六道几乎平行的裂痕。