agent

n.
1. organ,faculty or power of the body（身体的）器官，官能，力量。
△Mac.1.7.80:“Each corporal agent”，i.e.Every faculty of my body,all my bodily powers.全身的力量。
2. instrument by whose help something is effected 工具。
△2H.VI.3.2.114: “How often have I temptedSuffolk’s tongue,/The agent of thy foul inconstancy.To sit and witch me.”我曾经有多少次引诱萨福克（他是你可耻的虚情假意的工具）坐在我身边，用他的话语来迷惑我。