The second chapter is about traditional retrieval books, such as Index Medicus, Excerpta Medica, Biological Abstracts, and Chemical Abstracts.是什么意思_The second chapter is about traditional retrieval books, such as Index Medicus, Excerpta Medica, Biological Abstracts, and Chemical Abstracts.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句