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有时候,最难的事情和正确的事情是同一件事。
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
Happiness is the key to life. Without happiness, you have nothing.
感官训练可以培养敏锐的观察者,适应现在的文明时代,更能实际地应用于日常生活中。