最好的技术是无形的，它只是默默地发挥作用。
可持续性不是一种趋势，而是我们为后代共同承担的责任。
The study of quantum gravity is essential for understanding the early universe.
The boundaries which divide Life from Death are at best shadowy and vague. Who shall say where the one ends, and where the other begins?
真理的概念在任何足够强大以包含算术的形式系统中都是不可定义的。