如何乘坐自动扶梯更安全？词数 220 建议阅读时间 4分钟

ON April 17 at an outside-school activity in Shenzhen, a student was tying his shoelaces (系鞋带) on an escalator (自动扶梯) when it reached the floor. This caused a stampede (踩踏事件). Nine students were injured.