Abstract: There is a doctrine in meta-ethics, which is that the ethical propositions haven't the descriptive meanings. We observe all kinds of theories of “theunit of meaning” and find that the meaning of a linguistic unit such as a term, a sentence or a text is the capacity contacting the others on the same level.So a meaningful ethical proposition should be a complex one including a “substantial implication”i.e.“‘ought to do A’implies‘ought to do B’”.

Key words: ethical propositions, unit of meaning, meaning

摘要： 元伦理学在有意无意之间坚持了伦理命题没有“描述性”意义的教条。从“意义单位”理论出发,一个语言单位(语词、语句或话语)的意义,内在于它与同类单位发生联系而构成更高层次语言单位的能力,因此,一个有意义的纯伦理命题应该是一个“实质蕴涵”的复合命题,即“‘应该A’蕴涵‘应该B’”。

关键词: 伦理命题, 意义单位, 意义