exhaust purification

例句：

1. 1. The exhaust system in the factory needs to be regularly cleaned to maintain its efficiency.
   工厂的排气系统需要定期清理以保持其效率。
2. 2. The exhaust purification process is crucial for reducing emissions and protecting the environment.
   废气净化过程对于减少排放和保护环境至关重要。
3. 3. The exhaust purification system can effectively remove harmful substances from the exhaust gases.
   废气净化系统能有效从废气中去除有害物质。