smoke prevention staircase

例句：

1. 1. Thesmoke prevention staircase is a crucialpart of our school's health campaign.
   吸烟预防楼梯是我们学校健康运动的重要组成部分。
2. 2. Theschool has installed smoke prevention staircases to encourage students to avoid smoking inthe hallways.
   学校安装了吸烟预防楼梯，鼓励学生在走廊上避免吸烟。
3. 3. Thestaircase is designed to prevent smokefrom spreading throughout the building.
   楼梯设计用来防止烟雾在整个建筑内扩散。