seasoned  
adjective uk/ˈsiː.zənd/ us/ˈsiː.zənd/
  (EXPERIENCED)      
 经验丰富的;老到的
having a lot of experience of doing something and therefore knowing how to do it well
  a seasoned traveller 经验丰富的旅行者 
 a seasoned campaigner for human rights 经验丰富的人权活动家 
 Synonym: experienced 
Opposites: green (NOT EXPERIENCED) inexperienced
 - More examples
 - Nobody, not even the most seasoned professional, can observe a child the way a parent can.
 - She is a seasoned observer of the state's political scene.