I'm always looking for ways to improve, even when I'm at the top.

One ought never to turn one's back on a threatened danger and try to run away from it. If you do that, you will double the danger. But if you meet it promptly and without flinching, you will reduce the danger by half.

物理是思想的框架。 。。。追索到事情的本质，再从那里思考下去。

The power of abstraction is that it allows us to reason about systems at a higher level, without getting bogged down in the details.