大自然似乎有意让电的定律从大空间观察到的现象中推导出来，而不是从实验室狭窄范围内观察到的现象中推导出来。
To me, fearless is not the absence of fear. It's not being completely unafraid. To me, fearless is having fears. Fearless is having doubts. Lots of them. To me, fearless is living in spite of those things, every single day.
数学的美在于它既是艺术又是科学。