agent

agent [ag = to do 做; -ent = n. person 人]

• agent noun [C] (REPRESENTATIVE):
  a person who acts for or represents another 代理人 代理商;
  a person who represents an actor, artist, or writer （演员、艺术家、作家等的）经纪人，代理人
• agent noun [C] (SPY):
  someone who works secretly for the government or other organization 特工人员; 间谍
• agent noun [C] (CAUSE):
  a person or thing that produces a particular effect or change 原动力，动因；作用剂