Zhuang Zhou once had a dream. He dreamt of himself turning into a butterfly, flying in the air, feeling like he was real capriccioso butterfly. In his dream he was amused and exhilarated without noticing that this butterfly was only something in his dream. After a while, he woke up and found that he was still himself, not a butterfly. He felt surprised and couldn't tell whether it was he turned into a butterfly in his dream or a butterfly turned into him. I don’t know if I’m Zhuang Zhou or butterfly. This is a record of my dream.

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