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The so-called impurity can be said to be the demons and monsters in the world, or it can be said to be the evil of the human heart in this world. Opinions vary as to whether it still exists. Until now, I don't have a definite answer to its origin. From ancient times to the present, humankind's struggle against it has never diminished. On the contrary, due to many reasons in this world, the disasters caused by pollution are increasing year by year. We don't know where they came from or why they started. We only know that people gradually learned the power to contend with them through blood. We call these people...