精品无码久久久久久国产_成人午夜在线视频一区_亚洲最大的av网站_亚洲欧美综合区自拍另类_91精品国产一区_日韩精品中文在线观看_一道本无吗dⅴd在线播放一区_国产精品旅馆在线_欧美午夜久久久_亚洲自拍在线观看_黑人精品xxx一区一二区_亚洲精品日韩久久久_在线视频一区二区_国产欧美久久一区二区_中文字幕精品在线视频_成人欧美在线观看

To speak ill of others is a dishonest way of praising ourselves.

I tend to think that the longer you look at a thing, the more abstract it becomes, and, ironically, the more real.

要快樂，我必須擁有我的書和一片天空。

Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.

關于MM定理最重要的事情不是它的現(xiàn)實性，而是它的簡單性。