exhaust main

例句：

1. 1. The exhaust main is responsible for removing harmful emissions from the engine.
   排气主干负责从发动机中去除有害排放物。
2. 2.The exhaust main needs to be regularly cleaned to prevent blockages.
   排气主干需要定期清理以防止堵塞。
3. 3. The exhaust main connects the engine to the exhaust system, allowing air to flow out of the vehicle.
   排气主干将发动机连接到排气系统，允许空气流出车辆。