1、However, the science of xenotransplantation is much less straightforward.
然而，異種移植科學遠不是那么簡單。

2、Plagues aside, many critics see xenotransplantation as a colossal waste of resources.
除了疫病外，許多批評家把異種移植看作是資源的巨大浪費。

3、The main risk in xenotransplantation is the transmission of diseases.
異種移植存在的主要危險是傳播疾病。