可能近似正确（PAC）学习的概念在计算学习理论中具有基础性意义。
The concept of probably approximately correct (PAC) learning has been foundational in computational learning theory.
True innovation comes from questioning what we think we know.
自然的统一性不是一个事实，而是一项任务。
The coldest winter I ever spent was a summer in San Francisco.
公司的资本结构与其价值无关。
Profitability and sustainability must go hand in hand—they are not mutually exclusive.