法律是一个规则系统，是义务的主要规则与承认、变更和裁决的次要规则的结合。

Every age has its massive moral blind spots. We might not see them, but our children will.

煤炭行业必须依靠技术发展来可持续地满足全球能源需求

The ultimate search engine would understand everything in the world. It would understand exactly what you meant, and it would give you back exactly what you wanted.

可持续发展已不再是一种选择，而是我们对后代的责任。