smoke-free exhaust

例句：

1. 1.The new car has a smoke-free exhaust system to reduce pollution.
   这款新车配备了无烟排气系统，以减少污染。
2. 2.The factory uses a smoke-free exhaust system to comply with environmental regulations.
   该工厂采用了无烟排气系统，以符合环保法规。
3. 3.The car's exhaust system is designed to be smoke-free, ensuring a cleaner driving experience.
   汽车的排气系统设计为无烟，以确保更清洁的驾驶体验。