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A trend of thought that appeared in China during the Wei and Jin Dynasties advocating for Lao and Zhuang, generally refers to the metaphysics of the Wei and Jin Dynasties. The concept of "mysterious" was first seen in "Laozi": "Mysterious is mysterious, and it is the door to all mysteries." Wang Bi's "Laozi's Guide" said: "Xuan is what is said to be deep." Metaphysics is the study of profound and far-reaching issues.