对抗传染病的斗争是一项超越国界的全球性努力。
The fight against infectious diseases is a global effort that transcends borders.
The true value of a forest cannot be measured in board feet alone.
The dirty little secret is that you don’t have to be a nice person to be a great artist.
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。