1.And I think it's a more useful concept than sustainability, as I said.
我认为可恢复性理论比可持续理论更有用，正如我所说。
2.Knowledge discovery process in database is to formalize the knowledge contained in the database into a useful concept.
数据库知识发现的过程就是将数据库中蕴含的知识形式化为有用概念的过程。
3.And I think, in many ways, the idea of resilience is a more useful concept than the idea of sustainability.
我认为，在多方面，这种可恢复性理论比可持续理论更有用。
4.The elasticity of substitution is a useful concept in several areas of economics.
置换弹性在若干经济学领域内是一个有用的概念。
5.In these circumstances opportunity cost is a less useful concept.
在这些情况下，机会成本起的作用很小。
6.Another useful concept is the personal checklist.
另外一个有用的概念就是个人检查表。
7.This is very useful concept to reduce your code quantity and increase your code quality.
这是个对于缩减代码量和增加代码质量很有帮助的概念。
8.Bostrom: I don't think that perfection is a useful concept.
博斯特罗姆：我认为完美不是一个有用的概念。
9.I think it is a very good useful concept.
我认为这是一个很好的有用的理念。