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高級檢索方式 位置算符 (Proximity) ? W/n - 詞序任意,兩詞間最多可插入 n個字母 ? PRE/n-詞序一定, n為 第一個詞與第二個詞的第一個字母之間的字符數(shù) 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 邏輯算符- and, or, not, and not ? title (biology and plants) ? title (biology) and school (michigan state university) ? title (biology) or subject (biology) ? title (chemistry not anic) ? title (biology) and not school (michigan state university) 截詞符 ? ? title (biolog?) 命中 biology biological ? keyword (librar?) 命中 library , libraries , librarian”, librarians”,librarianship 詞組檢索 ? 用空格實現(xiàn)詞組精確檢索 examples: ? ti (cross country skiing) 命中 the exact phrase cross c