The best traders are those who can stay focused on their goals.
数学的研究是所有智力和精神进步不可或缺的基础。
学习应使人感到快乐，否则不能称之为真正的学习。
The human mind is so complex and things are so tangled up with each other that, to explain a blade of grass, one would have to make a diagram of the universe.
