closed riser

例句：

1. 1. The closed riser was used to transport heavy equipment from one floor to another.
   闭式升降机被用来将重型设备从一个楼层运送到另一个楼层。
2. 2.The closed escalator is a popular choice for people who need to move quickly and efficiently.
   闭式电梯是那些需要快速且高效移动的人的热门选择。
3. 3.The closed riser is equipped with safety features such as emergency stop buttons and automatic backup systems.
   闭式升降机配备了紧急停止按钮和自动备份系统等安全特性。