The poor are not irrational; they are just as rational as anyone else, but they operate under very different constraints.
穷人并非不理性；他们和任何人一样理性，但他们在非常不同的约束下行动。
The power of literature lies in its ability to make us feel less alone in the world.
The unity of mathematics is not imposed but discovered.
【讲解】：不怕东西少而怕分配不均匀，不怕贫困而怕不安定。