英语语法分析

Running swiftly on he overtook the horse, unfastened the towrope and cast off, jumped lightly on the horse's back, and urged it to a gallop by kicking it vigorously in the sides.

他飞快地跑，追上了那匹拖船的马，解开纤绳，扔在一边，轻轻纵身跃上马背，猛踢马肚子，催马奔跑。