数学家是模式的创造者，就像画家或诗人一样。
A mathematician is a maker of patterns, like a painter or a poet.
你无法改变过去，但可以改变未来。
"Books are the quietest and most constant of friends; they are the most accessible and wisest of counselors, and the most patient of teachers."
员工是企业最宝贵的财富，要善待每一位员工。