数学家的工作永远不会真正完成；总有更多的东西需要探索。

The past is not fixed; it shifts with our retelling.

It’s not supposed to be easy. Anyone who finds it easy is stupid.

The speed of learning determines the speed of growth.

The way we perceive the world is shaped by our expectations, and often, what we see is what we expect to see.

林业的未来在于平衡经济需求与生态责任。