以下为句子列表：
英文: Although the development of relatively non-toxic immunosuppressive or tolerance-inducing regimens will be required to justify clinical trials using pig organs, recent advances in our understanding of the biology of xenograft rejection and zoonotic infecti
中文: 尽管用猪的器官进行临床试验尚有赖于相对无毒的免疫抑制剂或致耐方法的发展，但是我们在异种移植排斥反应及猪源人畜共患病等方面生物学知识的进步，以及α1，3半乳糖转移酶缺陷猪的产生，已经使异种移植离临床应用更近了一步。
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英文: However, there are still limitations with transplants and corneal allograft rejection and failure is perhaps one of the biggest hurdles that needs to be overcome.
中文: 但是角膜移植因为移植物排异而导致手术失败仍是目前需要克服的最大难题。
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