single-stage single element ejector

例句：

1. 1. The single-stage processof the experiment is very simple.
   实验的单阶段过程非常简单。
2. 2. The company has asingle-stage production line for its products.
   该公司为产品设有单阶段生产线。
3. 3. Thesingle-stage system allows for easy maintenanceand upgrades.
   单阶段系统便于维护和升级。