descriptor

描述符

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

A blank field descriptor is a descriptor to make blank on output.

一个空白字段描述符是在输出中形成空格的描述符。