多样性不仅是道德要求，也是商业需求。

You are not the opinion of somebody who doesn't know you.

The moment one gives close attention to anything, even a blade of grass, it becomes a mysterious, awesome, indescribably magnificent world in itself.

The deepest principle in human nature is the craving to be appreciated.

追求数学知识是一段永无止境的旅程，充满了无尽的好奇和惊奇。