back purge system

例句：

1. 1. The back purge system is designed to remove contaminants from the exhaust gases before they reach the engine.
   回冲系统设计用来在废气到达发动机之前去除污染物。
2. 2. In this case, the back purge system was able to effectively remove the harmful substances from the air.
   在这种情况下，回冲系统能够有效地从空气中去除有害物质。
3. 3. The back purge system has proven to be a reliable solution for reducing emissions in industrial processes.
   回冲系统已被证明是减少工业过程中排放的一种可靠解决方案。