数字引用顺序 DRS DigitalReferenceSequence

文字引用 [计] literal reference

关键字索引 keyword index

字符引用 Character Reference

字顺索引 alphabetical index

索引字 [计] index word ; index terms

字索引 [计] word indexing

引证字符串 quoted string

数字电子引擎 digital motor electronics