I like crossing the imaginary boundaries people set up between different fields—it's very refreshing.

没有听到不如亲耳听到，亲耳听到不如亲眼见到，亲眼见到不如清楚知道，清楚知道不如亲自实践。

解释：不注意天时，财富就不能增长；不注意地利，粮食就不会充足。

My life is an unfinished song.

数学的历史是人类思想和进步的历史。