烟洞

例句：

1. 1. The factory has a large smoke tunnel that exhausts the exhaust fumes into the air.
   这个工厂有一个大型的烟道，将废气排放到空气中。
2. 2. The smoke tunnel is designed to reduce the amount of pollution in the city.
   烟道的设计是为了减少城市中的污染。
3. 3. The workers were forced to work in the smoke tunnel due to the lack of ventilation.
   由于通风不足，工人们被迫在烟道中工作。