"In mathematics, you don't understand things. You just get used to them."
预测未来的最好方法就是发明它。
The future of energy lies in the integration of traditional and renewable energy sources, not in their opposition.
你最不满意的客户是你最大的学习来源。
从n对观测值的样本中获得的相关系数的可能误差是sqrt((1-r²)/(n-2))。