I'm something that can run but can't walk.What am

I'm something that can run but can't walk.What am I'm something that can run but can never walk.What am 猜猜：I am something that can run but can not walk .What am I? I am something that can run but never walk what am I? I am something that can run but cannot walk.What am I am something that can run but never walk what am 用英语回答下列智力题 1 I’m something that can run but can’t walk.What I am something that can run but cant walk,what an I. I am something that has teeth but can't eat. What am I? 2条英语谜语1 I can run but l can't walk.What am 2 Why is a river I can't walk.I can swim.what am I have four legs.but i can't walk.what am i