illuminating       
adjective  formal uk/ɪˈluː.mɪ.neɪ.tɪŋ/ us/ɪˈluː.mə.neɪ.t̬ɪŋ/
 富有启发性的
giving you new information about a subject or making it easier to understand
  The book is full of illuminating detail on the causes of the war. 这本书中有关战争起因的细节很丰富,对读者很有启发性。 
 a most illuminating discussion 给人以极大启迪的讨论 
 Synonyms: enlighteninginformative