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

可持续发展不是选择，而是负责任企业的唯一出路。

"The most difficult thing is to make something simple."

I don't think you should ever regret anything. Everything happens for a reason.

有些事情太严肃了，你不得不对它们一笑置之。