safety roller

例句：

1. 1. The safety roller is a crucial component of the elevator system.
   安全滚轮是电梯系统的关键组成部分。
2. 2.The worker used the safety roller to prevent accidents during construction.
   工人使用安全滚轮在施工过程中防止事故。
3. 3. The safety roller helps to maintain stability and prevent slipping on wet or icy surfaces.
   安全滚轮有助于保持稳定性，防止在湿滑或冰面上滑动。