feedwater heater

例句：

1. 1.The feedwater heater is responsible for maintaining the water temperature in the plant.
   给水加热器负责保持工厂内水温。
2. 2. The new feedwater heater has significantly improved the efficiency of the process.
   新的给水加热器大大提高了生产过程的效率。
3. 3. The engineers had to replace the old feedwater heater with a more efficient model.
   工程师们不得不用更高效的模型替换旧的给水加热器。