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

食品安全方面的创新不是可选项，而是我们对消费者的道德义务。

诗人是灵魂的画家。

量子力学的美在于它能够揭示看似不相关现象之间的隐藏联系。

中国的崛起对自由民主秩序构成了重大挑战。