Our playground is not quite large, but it is quite standard. It is surrounded by a 400-meter runway covered with fine red sand and gravel. Due to the strong demands of the campus, even a slightly larger stone in the entire playground is very difficult to see. So when I walked barefoot, I was not injured at all. At this time, I would like to thank the usual mean health team leader for the three types of stadiums on the playground: baseball stadium, football stadium, and my favorite volleyball stadium