literature retrieval tool的用法和樣例：
例句
- Quotation Index is a new kind of retrieval means which is based on the document citation relations.
引文索引是建立在文獻引證關係之上的一種新型檢索工具。 - This tool retrieves its results from the Overture search engine so you will get the same information as the Overture Keyword Selector Tool.
這一結果從序曲檢索工具搜索引擎等你會得到同樣的資料作為序曲關鍵字選擇工具。
