二难推理共有28种有效推理形式。

There are 28 kinds of effective inference forms in dilemma.

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本文论述了二难推理的三个理论问题：一是构成式和破坏式的内涵界定问题；

The paper expounds three theoretical problems of the two-difficulty inference: First, demarcation of the connotation of formation and destruction;

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二难推理的规则仅仅是保证推理形式有效的规则，并不涉及前提内容的真实与否。

The regulations of dilemma inference are merely to guarantee the efficacy of the form of dilemma inference, it doesn't relate to whether the premise content is correct or not.

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二难推理的规则仅仅是保证推理形式有效的规则，并不涉及前提内容的真实与否。

The regulations of dilemma inference are merely to guarantee the efficacy of the form of dilemma inference, it doesn't relate to whether the premise content is correct or not.

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