What's This?这是什么？What's this?What's this?What's this?What? What?It's a hat, hat, hat.这是什么？这是什么？这是什么？这是一顶帽子，帽子，帽子。What's this?What's this?What's this?What? What?It's a bat, bat, bat.这是什么？这是什么？这是什么？这是一根棒子，棒子，棒子。What's this?What's this?What's this?What? What?It's a mat, mat, mat.这是什么？这是什么？这是什么？这是一块垫子，垫子，垫子。What's this?What's this?What's this?What? What?It's a cat, cat, cat.这是什么？这是什么？这是什么？这是一只小猫，小猫，小猫。