When I woke up, I found that I had gone back to thirty years ago. I saw my parents, classmates, and neighbors again. I walked through my previous life again, and I realized why the gap between people who grew up together is getting bigger and bigger. Although life cannot be repeated, it can serve as a warning to future generations about what they need to pay attention to when becoming parents. In fact, if you don't want many children, most of them are caused by your own mistakes. This is why many families with poor economic conditions are getting better and better.