lean gas riser

例句：

1. 1. The engineer designed a lean gas riser to improve the efficiency of the process.
   工程师设计了一个瘦长气体上升管来提高过程的效率。
2. 2. The lean gas riser was used to transport and distribute the gas throughout the plant.
   瘦长气体上升管被用来输送和分配气体在整个工厂中。
3. 3. The lean gas riser was crucial in maintaining the stability of the system.
   瘦长气体上升管在维持系统稳定性方面至关重要。