secondary orifice

例句：

1. 1. The engineer designed a secondary orifice to improve the efficiency of the pump.
   工程师设计了一个次级孔口来提高泵的效率。
2. 2. The surgeon performed a secondary orifice surgery on the patient's throat.
   外科医生为病人的喉咙进行了次级孔口手术。
3. 3.The scientist discovered a secondary orifice that could be used to regulate the flow of gases.
   科学家发现了一个可以用于调节气体流动的次级孔口。