复杂性理论告诉我们，并非所有问题都是平等的；有些问题本质上比其他问题更难。
"Complexity theory teaches us that not all problems are created equal; some are inherently harder than others."
"Children's literature has the power to shape minds and change lives."
世界不是一个令人愉快的地方，但它是我们唯一拥有的。