一句话一个克林斯字典基本单词A

88、ahead 1  adverb uses        
    Something that is ahead is in front of you. If you look ahead, you look directly in front of you.
   

89、ahead 2  preposition uses        
    If someone is ahead of you, they are directly in front of you. If someone is moving ahead of you, they are in front of you and moving in the same direction.
      

90、aid        
    Aid is money, equipment, or services that are provided for people, countries, or organizations who need them but cannot provide them for themselves.
   

91、AIDS        
      AIDS is a disease which destroys the natural system of protection that the body has against other diseases.  AIDS is an abbreviation for `acquired immune deficiency syndrome'.
   

92、aim        
      If you aim for something or aim to do something, you plan or hope to achieve it.
   

93、air        
      Air is the mixture of gases which forms the earth's atmosphere and which we breathe.
   

94、aircraft        
    An aircraft is a vehicle which can fly, for example an aeroplane or a helicopter.
   

95、air force        
        An air force is the part of a country's armed forces that is concerned with fighting in the air.
   

96、airline        
    An airline is a company which provides regular services carrying people or goods in aeroplanes.
    

97、airplane        
        An airplane is a vehicle with wings and one or more engines that enable it to fly through the air. (AM; in BRIT use aeroplane)