doctrine
/ˈdɔktrɪn; `dɑktrɪn/ n[C, U]
(any of a) set of beliefs held by a church, political party, group of scientists, etc 教义; 主义; 学说; 信条
Catholic doctrines 天主教教义
Marxist doctrine 马克思的学说
This is a matter of doctrine, ie must be accepted as true. 这是个基本信条（必须承认其为真理）.