agent /ˈeʤənt/
 媒介,動因,代理人,行為者,經紀人;作用物,藥劑


 agent /ˈeʤənt/ 名詞
 試劑,媒介物,原因,因素


 agent
 代理 劑


 A·gent a.  Acting; -- opposed to patient, or sustaining, action. [Archaic] “The body agent.”


 A·gent, n.
 1. One who exerts power, or has the power to act; an actor.
    Heaven made us agents, free to good or ill.   --Dryden.
 2. One who acts for, or in the place of, another, by authority from him; one intrusted with the business of another; a substitute; a deputy; a factor.
 3. An active power or cause; that which has the power to produce an effect, such as a physical, chemical, or medicinal agent; as, heat is a powerful agent.

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 agent
      n 1: an active and efficient cause; capable of producing a
           certain effect; "their research uncovered new disease
           agents"
      2: a substance that exerts some force or effect
      3: a representative who acts on behalf of other persons or
         organizations
      4: a businessman who buys or sells for another in exchange for
         a commission [syn: factor, broker]
      5: any agent or representative of a federal agency or bureau
         [syn: federal agent]
      6: the semantic role of the animate entity that instigates or
         causes the hapening denoted by the verb in the clause
         [syn: agentive role]