1Computing A defined standard structure for relational databases in which a relation may not be nested within another relation.
2Philosophy A standard structure or format in which all propositions in a (usually symbolic) language can be expressed.
英语词典包含464360条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。