boiler water circulation

例句：

1. 1. The new boiler water circulationsystem greatly improves the efficiency of theheating system.
   新的锅炉水循环系统大大提高了供暖系统的效率。
2. 2. The engineers were busymonitoring the boiler water circulation to ensure thesafety of the plant.
   工程师们忙于监测锅炉水循环，以确保工厂的安全。
3. 3. During themaintenance, the technicians carefully checked theboiler water circulation to prevent any potential problems.
   在维护期间，技术人员仔细检查了锅炉水循环，以防止任何潜在的问题。