"Okay," Zhang Zhongxing finished the last math problem, looked at the kids below who were diligently taking notes, and asked, "Is there anyone who still doesn't understand?"
The crowd was silent...
Zhang Zhongxing asked again, "Is there anyone who still doesn't understand?"
The crowd was silent...
"OK," Zhang Zhongxing nodded, erased the answers he had just written on the board, completely ignoring the students who hadn't finished copying, and started writing a new problem on the whiteboard. Once he finished, he put down the pen and said, "Now, solve this problem."
Looking at the incomplete notes and the new problem on the board with additional conditions, everyone felt that there were still unclear parts in their minds, wanting to review the examples from before but couldn't recall anything. They looked at Zhang Zhongxing blankly, though a few who remembered began to write quietly.
