经济增长的过程不是平稳和连续的;它以突飞猛进和停顿为标志。
数学的快乐来自于为理解而奋斗。
The essence of education means: one tree shakes another, one cloud pushes another, one soul awakens another.
The purpose of life is to live it, to taste experience to the utmost, to reach out eagerly and without fear for newer and richer experience.