The love of a teacher is like drops of dew, which can revive even a withered soul; the love of a teacher is like a warm spring breeze, which can melt even frozen emotions.
如果你想理解一个系统,试着改变它。
一个好的模型应该在复杂性和准确性之间取得平衡,捕捉基本动态而不过度拟合。
Pleasures, then, and the avoidance of pains, are the ends that the legislator has in view.