"The past is not a place to live, but a place to learn from."

The Erdős discrepancy problem fascinated me because it was so simple to state yet so deep in its implications.

世界可能很刻薄，但人们不必如此。

拥有朋友的唯一方式就是成为别人的朋友。

今天的科技投资确保明天的效率。