小時四隻腳, 30 小時四隻腳 大時二隻腳, 大時二隻腳 老時三隻腳。 老時三隻腳 猜 一 種動物 Guess what? 猜一種動物 When small, it walks on four legs. When grown, it walks on two legs. When old, it walks on three legs. ( An animal ) 41