renal medulla

例句：

1. 1. The kidneys are responsible for filtering blood and removing waste products.
   肾脏负责过滤血液和清除废物。
2. 2. The renal medullary region is where the nephrons are located.
   肾髓区域是肾小管所在的位置。
3. 3. Renal medullary carcinoma is a rare form of cancer that affects the kidneys.
   肾髓样癌是一种罕见的癌症，影响肾脏。