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

Economic theory provides the tools, but real-world testing refines them.

如果你想變富有，你需要緩慢而有條理地通過良好的決策來實現。

最好的數學不僅僅是邏輯的；它是直觀和創造性的，將嚴謹與想象力結合在一起。

The writer’s job is to write with rigor, with honesty, to the very end of his strength.

The only limit to our realization of tomorrow will be our doubts of today.

I am not a fast thinker at all. I have to spend a lot of time before I can understand something.