采石业必须与技术一起发展，否则就有落后的风险。

The urban artifact is a work of art and a historical document.

最深刻的真理往往最简单。

The hour of departure has arrived，and we go our separate ways，I to die，and you to live。Which of these two is better only God knows.

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。