The most important thing in mathematics is to understand the concepts, not just to memorize formulas.
每一块面包都在讲述一个故事,从面粉到最后的切片。
Free education is abundant, all over the Internet. It's the desire to learn that's scarce.
在弦理论的早期,我们就像是在绘制未知大陆的地图的探险家。
政治是可能的艺术,戏剧是不可能性的艺术。