underdraught

例句：

1. 1. The air is thick with the smell of smoke from the nearby factory.
   附近工厂的烟雾让空气都变得浓重。
2. 2.The river flows beneath the city, providing fresh water for the residents.
   这条河流经城市，为居民提供新鲜水源。
3. 3. The underdraft caused the boat to veer off course.
   逆流使船偏离了航道。