我问他是否想吃披萨，他只是摇摇头说"唔唔"表示拒绝。

When I asked if he wanted pizza, he just shook his head and said "___unh-unh".

“呃...我也不知道该选哪个颜色好，”他犹豫地说。

"___Unh-unh, I don't know which color to choose," he said hesitantly.