1. Describe the excretory system of the genus Nereis briefly.
   简述沙蚕属的排泄系统。
2. The development of the kidney, the major excretory organ after birth, consists of 3 stages: the pronephros, mesonephros and metanephros.
   肾脏是人体主要的排泄器官，它的发育经过原肾、中肾、后肾3个阶段。
3. Fluoride is a widely distributed nephrotoxin with exposure potentially resulting from environmental fluorine excess.Kidney is the main excretory organ of fluorine.
   肾脏是氟的主要排泄器官，当机体摄入过量氟超过肾的排泄能力时，肾组织细胞就会因处于高氟环境而受到损害。
4. Perioperative serum creatinine, electrolytes, blood gas, and a follow-up excretory urogram, cystogram, and pathological examination were used to assess the surgical outcome.
   手术前后的血清肌酸酐、电解质、动脉血气体分析以及追踪时取得肾盂摄影、膀胱摄影、病理检查来评估手术的结果。

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