社会是由某些关系或行为方式联合起来的个体的集合，这些关系或行为方式将他们与那些不进入这些关系或行为方式不同的人区分开来。

The companies that will thrive are those that see environmental regulations as opportunities, not obstacles.

As you grow older, you will discover that you have two hands, one for helping yourself, the other for helping others.

The development of formal systems has revolutionized our understanding of mathematics.

艺术家必须永远是一个初学者。

Sustainability isn't an option—it's a necessity for the future of dairy farming.

在量子力学中，粒子的概念失去了它通常的意义。