山羊胚胎重新反应了系统进化的过程，该过程通过前肾，中肾和后肾。
The goat embryo re-acted the process of the system evolution, which passed through pronephros, mesonephros and metanephros.
八目鳗类鱼有中肾，并且通常是其前肾的新生物。
Hagfish have a mesonephric kidney and are often neotenic of their pronephric kidney.
实验前，研究人员先征得了迪士尼乐园同意，然后把肾模型藏到背包中坐了20次巨雷山过山车，期间还变换位置，从头部换到尾部。
The researchers received permission from Walt Disney World first, then concealed the kidney model in a backpack and rode Big Thunder 20 times, varying their seat position between front and back.
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