英语语法分析

You've got to get rid of the ritual impurity, so there'll have to be some ritual procedure that purges the impurity.

你必须摆脱不纯洁的仪式，所以必须有一些手段来净化不纯洁。

According to Klawans and others, ritual impurity arises from physical substances and states which are not in themselves sinful.

据克洛文和其他人所说，仪式上的不洁产生于物质和状态，它们本身并不有罪。

What are these sources of impurity?

不纯洁的来源又是什么呢？