Its direct relationship with the thing that's most closely adjacent to it somehow either through similarity or dissimilarity can never be a relationship of identity.

符号和实物之间的关系,即使是最接近的事物,是通过相似处和不同处建立的,但是这不是一种永恒的关系。

耶鲁公开课 - 文学理论导论课程节选

But because of the similarity of the viruses, the immune response that people developed would also protect them against natural infections with variola.

因为这两种病毒很相像,人体的免疫应答也能保护自己,免受天花的感染

耶鲁公开课 - 生物医学工程探索课程节选