tenaciously       
adverb uk/təˈneɪ.ʃəs.li/ us/təˈneɪ.ʃəs.li/
 顽强地,坚韧地
in a very determined way
  He fought tenaciously to keep his job. 他顽强地抗争,以保住自己的饭碗。 
 - More examples
 - He has worked through that process tenaciously and successfully
 - Yet the club has tenaciously held on to its long-standing bingo tradition.
 - They clung tenaciously to their traditions and developed strategies to retain their heritage.
 - Ren turns out to be wily, brave, and tenaciously loyal.