Symbolic connotation is the extension of denotative meaning.
词的象征意义是其概念意义的延伸。
2
Clustering for symbolic data is an important extension of conventional clustering, and interval representation for symbolic data is often used.
符号聚类是对传统聚类的重要扩展，而区间数据是一类常见的符号数据。
3
Mathematical logic is an extension of symbolic logic into other areas, in particular to the study of model theory, proof theory, set theory, and recursion theory.