immersion  
noun [ C or U ] uk/ɪˈmɜː.ʃən/ us/ɪˈmɝː.ʃən/
  (INVOLVEMENT)         
  沉浸,专注
the fact of becoming completely involved in something
  Total immersion in a videogame is almost like living another life. 完全沉浸在电子游戏中,几乎就像过着另一种生活。 
  沉浸式学习(法)
the process of learning a language or skill by using nothing else but that language or skill
  We have all learned a complex set of grammar rules simply by immersion in a language since birth.  我们从一出生就沉浸在一门语言中,因此学会了一套复杂的语法规则。 
 advocates of the immersion method of language learning 对沉浸式语言学习法的提倡 
   (IN LIQUID)      
 formal浸没(于液体中) 
the act of putting something or someone completely under the surface of a liquid
  They practise baptism by total immersion. 他们实行完全浸没式洗礼。