machine with open-circuit ventilation

例句：

1. 1.The machine was designed to make coffee.
   这台机器被设计用来制作咖啡。
2. 2.He used a machine to clean the floor.
   他用机器来清洁地板。
3. 3. The machine is essential for this task.
   这台机器对于这项工作至关重要。