Hunger and poverty are the root causes of much of the world's unrest and misery.

经济学的目标是理解如何以最高效的方式分配稀缺资源。

Life is made up of sobs, sniffles, and smiles, with sniffles predominating.

"To love is to risk not being loved in return. To hope is to risk pain. To try is to risk failure, but risk must be taken because the greatest hazard in life is to risk nothing."

我不是没素材了，我只是没时间了。

将每个困难分解为尽可能多且必要的部分来解决它。