出处：按学科分类—语言、文字 中国对外翻译出版公司《汉英成语词典》第262页（212字）
比喻按照线索或图样去寻找需要的东西，例警方拿着歹徒的照片，按图索骥把歹徒找了出来。
After the police got the pictures of the scoundrels，they scrutinized them care fully trying to identify the guilty ones．