安全困境是国际政治的一个基本特征，因为国家增加自身安全的努力往往会降低其他国家的安全。
The security dilemma is a fundamental feature of international politics, as states' efforts to increase their own security often decrease the security of others.
计算机图形学中的挑战在于用数学模型的简单性来模拟现实世界的复杂性。
生命是一段旋律，让它变得美丽。
Boundaries define us. They define what is me and what is not me. A boundary shows me where I end and someone else begins, leading me to a sense of ownership.
Every product should be designed with its next life in mind.