orifice of inferior vena cava

例句：

1. 1.The surgeon carefully removed the tumor from thepatient's orifice.
   外科医生小心翼翼地从病人的开口处取出了肿瘤。
2. 2. The scientist discovered a new orifice in the ocean floor.
   科学家在海底发现了一个新的开口。
3. 3. The engineer designed an orifice for the ventilation system.
   工程师为通风系统设计了一个开口。