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At around nine o'clock in the evening, my brother called me, asked me about my health as usual, and then chatted to maintain the relationship between brothers. Finally, he said: "I disappeared one day, you go home and see me!" He disappeared, I went home to see him, can I see him? I was about to ask him when I heard a beep; when I called back, he turned off his phone. Before he finished speaking, he turned off his phone. What happened? After waiting for a while, I called again and the phone finally got through. He said that in the hardware warehouse, the signal was unstable and calls were cut off automatically. I said, "You suddenly said you were missing. Did something serious happen?" He said, "People always talk a lot, so don't worry if you talk nonsense." My brother is sixty-five years old. According to the standards of the World Health Organization, he is at the end of his youth. He is not particularly old.