Therefore it does not appear to be either possible or worthwhile to define a concept which, of necessity, would have to be arrived at by common agreement on the basis of available scientific and technological inputs and the practical realities of the context.
因此，看来不可能、或不值得确定一个必须根据现有的科学和技术信息和相关现实状况且应通过共同协议加以达成的概念。