The scientific methodology of the economics should be dialectical union of induction and deduction, verification and falsification, logic and history, positivism and norm.
经济学方法的出路应该是归纳和演绎，证实和证伪，逻辑与历史，实证与规范的辩证统一。
We know other things, for instance that two and two make four, through our powers of logic or reasoning or deduction.
我们如果要知道其他的事，比如，二加二等于四，则必须依靠逻辑、推理或演绎能力。
In the view of logic, reasoning is the use of knowledge and logic deduction.
从逻辑的角度来看，对知识的利用就是推理，就是逻辑演绎。
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