Many years ago, I was sitting in the last row of the classroom, looking at you on the podium, and writing Be there or be square on the blackboard one by one. Then he turned his head and said with a smile, this phrase means see you or not. I smiled and silently wrote these five words on the first page of the exercise book. My dear, you are leaning on my arms many years later. Do you know that I silently thought in my heart that once we meet, we will never be separated again. . .