目前，关于肝脏干细胞或肝脏前体细胞移植的研究多限于实验动物的翻译：At present, studies on the transplantation of stem cells in liver or liver progenitor limited to laboratory animals 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Currently, stem cells of the liver or liver precursor cell transplantation studies mostly limited to experimental animals

At present, studies on the transplantation of stem cells in liver or liver progenitor limited to laboratory animals

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At present, studies on the transplantation of stem cells in liver or liver progenitor limited to laboratory animals