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The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.
Democracy is the only system that can reflect the human spirit's indomitable will to be free.
I'm the reason your snow won't melt.
两个物体的相互作用力总是大小相等,方向相反,同时出现或消失且作用于同一直线上。