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 process of solving a mathematical problem is often more important than the solution itself.

True progress is measured not just in profits, but in positive impact.

I'm a survivor. I'm like a cockroach, you just can't get rid of me.

A good book should be an axe to break the frozen sea within us.

最有力的故事是那些與我們自身經(jīng)歷共鳴的故事。