The injured dog had some difficulty going home.Every step he took, he slipped back two. However, he still manage to get home. How did he do it?

 
  • 受了伤的小狗回家无比艰难,他每向前走一步,就得向后滑两步,但是就是这样他还是回到家了,请问他是怎样做到的?
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