主要的义务规则是那些要求或禁止某些行为的规则。
可持续发展不仅仅是保护树木;它关乎确保自然和人类共同繁荣的未来。
The best ideas often come from listening to those closest to the problem.
过去已成过去,但未来是一张白纸。
Architecture must negotiate between the pragmatic and the poetic.