In the world of physics, we often find that the simplest questions are the hardest to answer.

Markets are not just about transactions; they are about the flow of information and the trust that underpins those transactions.

抽象的目的不是模糊，而是创建一个新的语义层次，在这个层次上可以绝对精确。

在计算学习的背景下，“可能近似正确”（PAC）学习的概念为理解学习算法的效率和可行性提供了一个框架。