hilus of kidney

例句：

1. 1. The kidney is located in the lower abdomen behind the ribcage.
   肾脏位于肋骨下方的腹部。
2. 2. The hilus of the kidney is where blood vessels enter and exit the organ.
   肾的腹侧是血管进入和离开器官的地方。
3. 3. During surgery, the surgeon must carefully dissect the hilus to remove the tumor.
   在手术中，外科医生必须小心地分离肾的腹侧以切除肿瘤。