The concept of reducibility is central to understanding the relationships between different computational problems.

In all affairs， it's a healthy thing now and then to hang a question mark on the things you have long taken for granted.

乳制品应该既营养又美味。

我们必须平衡短期需求和长期可持续性，以创造持久的价值。

地理学是研究地方的科学。它的视野宏大，视角全景。