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"When you are young, you think you can leave and never look back. But you always do."

Always give credit， take blame.

In times of change, the learners inherit the earth while the learned find themselves beautifully equipped to deal with a world that no longer exists.

對稱性是降低復雜性的概念（協(xié)同例程包括子例程）；到處尋找它。