一句话一个克林斯字典基本单词A

30、acre        
      An acre is an area of land measuring 4840 square yards or 4047 square metres.
    

31、across        
    If someone or something goes across a place or a boundary, they go from one side of it to the other.
   

32、act        
    When you act, you do something for a particular purpose.
    

33、act out            
      If you act out an event which has happened, you copy the actions which took place and make them into a play.
      

34、act up            
      If something is acting up, it is not working properly. (INFORMAL)
      

    35、action        
    Action is doing something for a particular purpose.
      

36、active        
      Someone who is active moves around a lot or does a lot of things.
      

37、activist        
      An activist is a person who works to bring about political or social changes by campaigning in public or working for an organization.
      

38、activity        
      Activity is a situation in which a lot of things are happening or being done.
      

39、actor        
      An actor is someone whose job is acting in plays or films. `Actor' in the singular usually refers to a man, but some women who act prefer to be called `actors' rather than `actresses'.