C718
"Dongdong, do you know what this is?" Ding Qian took out a small silver ball from his pocket with a thin chain tied to it.
The little boy took a closer look, moved his lips and whispered a single word, "Ball."
"Yes, it's a ball." Ding Qian raised the chain and hung the ball upright.
The boy stared at the ball, lost in thought.
"Let's play a game together. Look
