安全不是产品，而是一种能力。

从我巨大的悲伤中，我创作出我的小歌谣。

What is the difference between a Turing machine and the modern computer? It's the same as that between Hillary's ascent of Everest and the establishment of a Hilton hotel on its peak.

"The past is always tense, the future perfect."

I'm not perfect, but I'm always me.