创新的速度决定发展的高度。
The speed of innovation determines the height of development.
Mathematics is a living subject, constantly evolving with new ideas and discoveries.
Democracy... while it lasts is more bloody than either aristocracy or monarchy. Remember, democracy never lasts long. It soon wastes, exhausts, and murders itself. There is never a democracy that did not commit suicide.
我接手的每一个角色都是一个挑战，这就是让我继续前进的动力。
The farmer is the only man in our economy who buys everything at retail, sells everything at wholesale, and pays the freight both ways.