色多多在线观看播放-色多多在线观看高清免费-色多多在线观看视频-色多多在线看-欧美aaaaa性bbbbb小妇-欧美aaaav免费大片

The greatest problem for mathematicians now is probably the Riemann Hypothesis.

I always believe that as long as you persist, nothing is impossible.

理論物理學之于數學，猶如雕塑之于幾何學。

我不相信悲觀主義。如果事情沒有按照你希望的方式發展，那就繼續前進。如果你認為會下雨，那就會下雨。

"Success is not about money. It's about the difference you make in people's lives."

美玉和石塊同匣并放，魚眼和寶珠一起貫穿。劣馬和駿馬混雜不分，老牛駕轅，駿馬兩邊。