counterflow boiler

例句：

1. 1. The new counterflow boiler significantly improved the efficiency of our factory's heating system.
   新的逆流锅炉显著提高了我们工厂供暖系统的效率。
2. 2.The engineer designed a counterflow boiler to heat the water for the hotel's swimming pool.
   工程师设计了一个逆流锅炉来为酒店的游泳池加热水。
3. 3. The counterflow boiler was used in the industrial process to remove impurities from the water.
   逆流锅炉被用于工业过程中，以从水中去除杂质。