Sustainable development requires balancing economic growth with environmental protection.

To be aware of the idea of social structure and to use it with sensibility is to be capable of tracing such linkages among a great variety of milieux.

The dead are not powerless. Dead, did I say? There is no death, only a change of worlds.

Legal systems are not static; they evolve over time.

不要烦恼啊不要烦恼，心怀烦恼的人更容易衰老。

可持续性不是一种趋势，而是我们对后代的责任。