Every person must have a thought that changes them, or a book, or a word, or a moment; and if they don't, their life is wasted.
相机就像武器;如果你不知道如何使用它,它就很危险。
The beauty of mathematics lies in its simplicity and universality.
问题的解决不是机械地应用过去的经验,而是通过重构情境来实现。