但是数十年来，由于慢性排斥和免疫抑制剂的毒副作用，使得器官移植的长期存活率无明显改善。

However, a constant proportion of organs were lost every year due to chronic allograft rejection and immunosuppressive drug toxicity.

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但是数十年来，由于慢性排斥和免疫抑制剂的毒副作用，使得器官移植的长期存活率无明显改善。

However, a constant proportion of organs were lost every year due to chronic allograft rejection and immunosuppressive drug toxicity.

youdao