过去从未真正过去，它徘徊在我们生活的角落。

The beauty of physics lies in its ability to explain the complex with the simple.

Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution.

The security dilemma is a fundamental feature of international politics, as states' efforts to increase their own security often decrease the security of others.