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。