Now, the interest rate in Irving Fisher's world has to equate supply and demand in the market for debt.

在费雪的理论里,利率必须与,债券市场的供需关系保持平衡

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which, the, I think, the subfields are Political Theory, International Relations,

像是政治理论和国际关系的分支，

关于政治学 - SpeakingMax英语口语达人

He developed the theory of classical conditioning by making a distinction between two sorts of conditioning, two sorts of stimulus response relationships.

他通过区分两种条件作用,两种刺激反应关系，提出了经典条件作用理论。

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There's almost an arithmetic relationship theory that they put forth.

他们提出的是基于算数关系的理论

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