A word, symbol, or number used as a descriptor for retrieval of information from a collection, especially in a coordinate indexing system.

用作描述符的一种字、符号或数，用于从某一集合中，特别是从某一配位标引系统中检索信息。

youdao

A word, symbol, or number used as a descriptor for retrieval of information from a collection, especially in a coordinate indexing system.

用作描述符的一种字、符号或数，用于从某一集合中，特别是从某一配位标引系统中检索信息。

youdao