The progress of mathematics is measured by the number of problems it can solve.
数学的进步是通过它能解决的问题数量来衡量的。
我不后悔做过的事，只后悔有机会时没做的事。
"A book is a conversation between the author and the reader, across time and space."
I was not born blind, I became blind at the age of 12, but I never felt like a victim.
心理学的真理存在于实践经验中。
数学的美在于它能够以最简单的术语描述宇宙。