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。
A mathematician's work is never truly finished; there is always more to explore.
Sustainability isn't an option; it's a responsibility we owe to future generations.
当你有一个好收成时,农民高兴,他的妻子高兴,孩子们高兴,动物们高兴,土地也高兴。