The injured dog had some difficulty going home. Every step he took, he slipped back two. However, he still managed to get home. How did he do it?
英
美
- 受了伤的小狗回家无比艰难,他每向前走一步,就要向后划两步,但是就是这样他还是回到家了,请问他是怎么做到的?
