布莱克-斯科尔斯公式的美妙之处在于它仅依赖于一个不可观测的参数，即股票的波动率。

The utility of an idea determines its place in mental life.

The stream of thought is the stream of life solving its problems.

The most important thing is that you have a North Star. You have to know where you're going.

安全是我们所有作业中的首要任务。

"I am a writer, not a speaker."

"A good picture book should work without any words at all."

要注重方向而非盲目努力

光芒从一个山脊传到另一个山脊。

我是个战士，我相信积极和努力的力量。