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

"I don't think about the past. I don't think about the future. I just think about now."

The attosecond timescale is to electron motion what the high-speed camera was to studying animal locomotion.

市場在短期內是投票機，在長期內是稱重機。

The only real failure is not trying.

The pursuit of truth is the noblest endeavor of mankind.

"I’ve learned more from my losses than from my wins."

Do not let yourself be tainted with a barren skepticism.