When the first year of high school started, Xu Xing and Zhuang Yizhou said, "Write down the final formula for me, otherwise I will definitely forget it if I go back and do the questions myself."
When they were in the second grade of high school, Xu Xing and Zhuang Yizhou said: "The boat is in the river and the sea. If you don't want to ride on it, you can't do it. I give this sentence to you."
When they graduated from high school, Xu Xing and Zhuang Yizhou said: "You are a boat, but I am a pedestrian. Let's go back to the bridge and the road to the road."
When they reunited, Xu Xing wrote on his homepage: "I traveled more than ten thousand miles east to Chang'an, how could I regret a single line of writing from an old friend." Then he set it to be visible to himself.
When the first year of high school started, Zhuang Yizhou wanted to tell Xu Xing, if you don't understand the last part, you can ask me again.
When he was divided into classes in his second year of high school, Zhuang Yizhou wanted to tell Xu Xing that he would go to a waterless place and sit and watch the clouds rise.
When he graduated from high school, Zhuang Yizhou wanted to tell Xu Xing that the boat will straighten out when it reaches the bridge.
When they reunited, Zhuang Yizhou posted his first message on WeChat Moments: "Happy birthday, just come back."