Many children watch a circus show(马戏表演)with their parents on Christmas Eve. As soon as the clown shows up(登场), everyone is happy except a little girl in the first row. There is no smile on her face. The clown tries his best to make the girl laugh. But he doesn't succeed. Why? In fact, the girl can't see anything from birth. She can't understand the happiness. After listening, the clown gets silent(沉默). He says to the girl, "Let me show you again. This time, please touch(触摸) my face and body." The clown begins his show. His face and body keep moving(一直在动). Gradually, the girl works out(感受到)a bear and a pig. She seems(好像)to see them. She finally laughs. "I have never been so happy. Dad, Mum, l know the clown. He is the best Christmas present!" the girl says happily.