purge gas recovery

例句：

1. 1. The process of purging gas recovery is crucial for maintaining the cleanliness of the environment.
   净化气体回收过程对于保持环境清洁至关重要。
2. 2. The purging gas recovery system was designed to efficiently remove harmful pollutants from the air.
   净化气体回收系统被设计用来高效地从空气中去除有害污染物。
3. 3. During the purging gas recovery process, the waste gas is first filtered and then sent to a purification unit for further treatment.
   在净化气体回收过程中，废气首先经过过滤，然后送往一个净化单元进行进一步处理。