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代理人;代理商
An agent is a person who looks after someone else's business affairs or does business on their behalf.
例句
You are buying direct, rather than through an agent.
你這是直接購買，而不是通過代理人。
...a written declaration by someone, authorizing another person to act as his agent.
一份某人授權他人為其代理人的書面申明
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（藝術領域的）代理人，經紀人
An agent in the arts world is a person who gets work for an actor or musician, or who sells the work of a writer to publishers.
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間諜；特務
An agent is a person who works for a country's secret service.
例句
All these years he's been an agent for the East.
這些年來他一直是為東方國家效力的一位間諜。
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動力;媒介;因素;工具
If you refer to someone or something as the agent of a particular effect, you mean that they cause this effect.
例句
In many societies young men regard themselves as highly active, the agents of change, shapers of the world.
在許多社會中，年輕人將自己看成是高度活躍的分子，是變革的推動者和世界的塑造者。
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（化學）劑;作用劑
A chemical that has a particular effect or is used for a particular purpose can be referred to as a particular kind of agent.
例句
...the bleaching agent in white flour.
白面粉中的漂白劑
...fibrinogen, a blood clotting agent.
血纖維蛋白原，一種凝血劑