So Klawans notes in the article you read that the physical substances and states that are labeled impure and are therefore designated as antithetical to the realm of holiness are states that are associated with death on the one hand, and procreation on the other. Why should this be?

克洛文对你们现在读到的文章有过这样的说明,那些被贴上不洁标签,然后被认为和神圣的领域相对立的物质和状态,一方面来说都和死亡有关系，而另一方面和生殖有关，这是怎么回事呢？

耶鲁公开课 - 旧约导论课程节选