enduringly       
adverb uk/ɪnˈdʒʊə.rɪŋ.li/ us/ɪnˈdʊr.ɪŋ.li/
 经久不衰
in a way that continues to exist for a long time
  an enduringly popular book 一本经久不衰的畅销书 
 He is a critic, and he is enduringly passionate about music.  他是一位评论家,对音乐有着持久的热情。 
 See: enduring
 - More examples
 - It is a straightforward, enduringly lovable film adaptation of the novel.
 - Beethoven’s 9th has become one of the most enduringly popular symphonies of all time.
 - She admitted that despite her enduringly youthful image, she sometimes felt her age.