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Mental activity is the organism's dialogue with its environment.
The less secure a man is, the more likely he is to have extreme prejudice.
我不认为每个人都应该成为数学家,但我确实相信许多学生没有给数学一个真正的机会。
设计不仅仅是看起来和感觉如何,设计是它如何运作。