oracle
noun [ C ] uk/ˈɒr.ə.kəl/ us/ˈɔːr.ə.kəl/
（尤指古希腊的）女祭司;神谕
(especially in ancient Greece) a female priest who gave people wise but often mysterious advice from a god, or the advice given
行家，专家
someone who knows a lot about a subject and can give good advice
Professor Ross is regarded as the oracle on eating disorders. 罗斯教授被视为研究进食障碍方面的专家。