machine with closed-circuit ventilation

例句：

1. 1. The machine has been repaired and is now working properly.
   这台机器已经修理好了，现在能正常工作了。
2. 2. This machine can be used for many different tasks.
   这台机器可以用于许多不同的任务。
3. 3. The engineers are busy installing the new machine in the factory.
   工程师们正在忙着在工厂安装新机器。