fluency  
noun [ U ] uk/ˈfluː.ən.si/ us/ˈfluː.ən.si/
  (LANGUAGE)      
 B2 (说或写)流利,熟练
the ability to speak or write a language easily, well, and quickly
  One of the requirements of the job is fluency in two or more African languages. 该工作的要求之一是熟练掌握两种或更多的非洲语言。 
 His time here is certainly improving his fluency. 他在这里的这段时间肯定会提高他的流利程度。 
 - More examples
 - Girls generally do better than boys in tests that involve verbal fluency.
 - She is hoping to achieve a higher level of fluency and accuracy.
 - They have hired teachers to help those students who lack fluency in English.
 
  (MOVEMENT)      
 (动作等)优美自然
an attractive smooth quality in the way someone or something moves
  As a player he possesses great fluency of movement. 作为一名球员,他的动作非常流畅。 
 Her gestures have grace and fluency. 她的手势优雅流畅。 
 - More examples
 - The fussy costumes allow for little fluency of movement.
 - The team struggled to move the ball with any fluency.
 
See: fluent