Well, a human, one of your legs works like two legs of a trotting dog, or works like three legs, together as one, of a trotting insect, or four legs as one of a trotting crab.
这个..一个人的一条腿腿走起来像一只疾跑的狗一侧的两条腿 或者像一只昆虫身上三只同时动作的腿 或是螃蟹体侧同时行动的四条腿