renal tubule

例句：

1. 1. Renal function testsare used to diagnose kidney diseases.
   肾功能测试用于诊断肾脏疾病。
2. 2. The kidneys filterwaste products from the blood and remove excesssalts.
   肾脏过滤血液中的废物和多余的盐分。
3. 3. Kidney failure can leadto a host of health problems if nottreated promptly.
   如果不及时治疗，肾脏衰竭会导致一系列健康问题。