primary nozzle

• 一次喷嘴

primary nozzle的用法和样例：

例句

1. Nozzle provided for external steam supply.
   提供了外部蒸汽发生装置的喷嘴。
2. He pointed the nozzle of the fire distinguisher at the flames.
   他将灭火器的喷嘴对著火焰。