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

數學不知道種族或地理界限；對于數學來說，文化世界是一個國家。

Science is not a race; it’s a journey of patience and precision.

The key to successful investing is to have a strong understanding of the fundamentals, a disciplined approach, a clear understanding of the market, and a long-term perspective.