The paper's authors tried to take into account other factors, but they admit it may not have been entirely possible to quantify differences in, for example,the recipient's health, which can be a big factor in the success of a transplant.

VOA: standard.2010.07.14

The same problem is with organ transplantation is that the recipient has to be matched to the donor and so that's a problem.

和器官移植中的问题一样,受体需要与供体匹配,这就是问题所在

耶鲁公开课 - 生物医学工程探索课程节选

That's a big problem and so can you protect these cells that you give to the recipient from attack by the recipient's immune system?

并且至关重要,那么你们想办法保护这些植入受体的细胞,使它们免受免疫系统的排异反应么

耶鲁公开课 - 生物医学工程探索课程节选

It's a secret number so that if Julius Caesar scrambled his message with the key 13, well, then the recipient had better know what that number is or realistically, -- and this is why it's kind of hard to buy -- into some of these age old algorithms, -- what would an alternative approach be to figuring out Julius Caesar's messages to his generals if he didn't know that secret number was 13?

它是一个机密的数字，以至于,如果凯撒大帝使用密钥13加密了它的消息，然后接收者最好知道那个数字是什么,实际上--这就是为什么很难,破解这些古老的算法-,有什么变换方法使凯撒大帝的将军,可以解密凯撒大帝的消息，如果他不知道,那个机密数字是13呢？

哈佛公开课 - 计算机科学课程节选