The pursuit of a unified theory of physics is not just an academic exercise; it is a journey towards understanding the very fabric of reality.
The great challenge of the modern world is to create institutions that are strong enough to govern effectively but also accountable and responsive to the needs of citizens.
每个城市都有性别和年龄，这与人口统计无关。
当你点燃蜡烛时，你也投下了阴影。