coolant circulation unit

例句：

1. 1.The coolant circulation unit is responsible for maintaining the temperature of the engine.
   冷却剂循环单元负责保持发动机的温度。
2. 2. The engineers designed a new coolant circulation unit to improve efficiency.
   工程师们设计了一个新的冷却剂循环单元以提高效率。
3. 3. The coolant circulation unit was replaced after several years of use, as it had become clogged with debris.
   冷却剂循环单元在使用几年后被更换，因为它被杂物堵塞了。