非经典逻辑的研究不仅是一种学术练习，更是理解复杂系统的必要条件。
矿业中的多样性不是可选项，而是发展的必要条件。
That is what learning is. You suddenly understand something you've understood all your life, but in a new way.
Development economics is ultimately about improving people's lives.
In the old world, you devoted 30% of your time to building a great service and 70% of your time to shouting about it. In the new world, that inverts.
可持续性不仅仅是种树，而是确保它们世代茁壮成长。
A good mystery is like a good joke—it's all in the timing.