数学的研究就像空气或重力——它无处不在,你看不到它,但你知道它在那里。
The study of mathematics is like air or gravity—it is everywhere, and you can't see it, but you know it's there.
旅行对我来说,是恢复青春活力的源泉。
Memory is the diary we all carry about with us.
【释义】技艺本身没有高低大小之分,最可贵的是能够精通。