每年冬季许多青少年拿上冰鞋、滑冰车在天然的湖泊、河流冰面上尽情玩耍，还有一些没有任何运动工具的儿童用他们的双脚和双手，溜冰或打雪仗。在享受大自然给子快乐时，他们没有注意到在白雪覆盖的冰面上潜伏着许多危险。例如，冬季来临时冰层没有完全冻结实，天气太热冰已开 Every winter, many teenagers take skates, skating cars play on natural lakes and river ice, and children without any sporting tools use their feet and hands to skate or snowball. While enjoying nature and giving their children happiness, they fail to notice the many dangers lurking in the snow-covered ice. For example, when the winter comes, the ice is not completely frozen, and the weather is too hot