cooled metal nozzle

例句：

1. 1.The new model uses a cooled metal nozzle to improve the efficiency of the heating system.
   这款新型模型使用了冷却金属喷嘴来提高加热系统的效率。
2. 2. The engineer used a cooled metal nozzle to inject water into the engine.
   工程师使用了一个冷却金属喷嘴将水注入发动机。
3. 3.The cooled metal nozzle was designed to prevent the spread of oil and gas during the operation.
   这个冷却金属喷嘴的设计是为了在操作过程中防止油和气体的扩散。