doc·trin·al /ˈdɑktrənḷ, ||dɑkˈtraɪ-/
  (a.)教義的,教條的,學理上的
  doc·tri·nal a.
  1. Pertaining to, or containing, doctrine or something taught and to be believed; as, a doctrinal observation. “Doctrinal clauses.”
  2. Pertaining to, or having to do with, teaching.
     The word of God serveth no otherwise than in the nature of a doctrinal instrument.   -- Hooker.
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  Doc·tri·nal, n. A matter of doctrine; also, a system of doctrines.
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  doctrinal
       adj : relating to or involving or preoccupied with doctrine;
             "quibbling over doctrinal minutiae"