当你无法回头时，你只能担心如何向前迈出最佳的一步。
The concept of reducibility is central to understanding the relationships between different computational problems.
The Internet is the most important single development in the history of human communication since the invention of the printing press.
The future of AI is in the hands of those who can combine technical skills with domain expertise.
Climate change and overfishing are twin threats we must tackle together.