一个英语句子----关于介词的用法

问题描述:

一个英语句子----关于介词的用法
It is vividly depicted in the cartoon that a boy is running along the racetrack with painstaking efforts,sweat pouring downing his face.
这句话中最后的pouring downing ,为什么down后要加ing呢,可以用pouring down吗?

应该用pouring down
pouring downing好像是打印错误的