置算符( Proximity) Wn一词序任意,两词间最多可插入n个 字母 ●PREn一词序一定,n为第一个词与第 个词的第一个字母之间的字符数
位置算符 (Proximity) ⚫ W/n －词序任意，两词间最多可插入n个 字母 ⚫ PRE/n－词序一定，n为第一个词与第二 个词的第一个字母之间的字符数
置算符一例 o intelligent W/10 buildings 命中 intelligent buildings buildings that are intelligent military PRE/1 weapons 命中" military weapons
位置算符－例 ⚫ intelligent W/10 buildings 命中 “ intelligent buildings ” “ buildings that are intelligent” ⚫ military PRE/1 weapons 命中 "military weapons