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You say human nature is very good, Do you believe in human nature? When faced with great difficulties; When faced with great danger; When faced with huge interests; When despair is right in front of you, Human nature doesn't seem to be that important anymore. So, do you still believe in the so-called human nature?

Yan Xiu, 18 years old this year, is a senior in high school. He has excellent grades in school and is unrivaled in fights. He is also ranked third on the school's draft list. But why...