出版社版lt is thought that ethical natural is one of the most influential theories of meta-ethics. But we cannot say that ethical naturalists have succeeded in the analyses of moral concepts. On the one hand, semantical naturalism has been prey G.E.Moore's open question argument(OQA). Semantical naturalism claims that 'good'means the same as 'pleasant', but Moore's OQA exposes its naturalistic fallacy.Ontological naturalism, on the other hand, does not commit itself to the synonymy of moral and non-moral words.But even then,ontological naturalism cannot divert OQA.The story of ontological naturalism includes the a priori part and its a priori part is the target of OQA. In any case, ethical naturalists has been poor at conceptual analysis. But ...