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

Mathematics is not a careful march down a well-cleared highway, but a journey into a strange wilderness, where the explorers often get lost.

The most powerful force in the universe is compound interest.

看看你最終非常滿意的一天。這不是你無所事事地閑逛的一天；這是你有一切要做并且你已經完成了的一天。

I don't work with ideas, I work with materials.

用愛和慈悲去對待所有生靈。