didactical
  (a.)好教誨的;教訓的
  Di·dac·tic Di·dac·tic·al a.
  1. Fitted or intended to teach; conveying instruction; preceptive; instructive; teaching some moral lesson; as, didactic essays. “Didactical writings.”
     The finest didactic poem in any language.   --Macaulay.
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  didactical
       adj : instructive (especially excessively) [syn: didactic]