casing elevator

例句：

1. 1. The casing elevator is acrucial component of the building's elevatorsystem.
   外壳电梯是大楼电梯系统的关键组成部分。
2. 2.The engineers were busy installing the newcasing elevator in the factory.
   工程师们忙于在工厂安装新的外壳电梯。
3. 3. Thecasing elevator was designed to providea smooth and efficient ride for passengers.
   外壳电梯被设计为为乘客提供平稳且高效的乘坐体验。