The book contains an excellent discussion of modal logic.

这本书包含了有关模态逻辑的精彩探讨.

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Modal logic, as a non - classical logic, is different from classical logic.

模态逻辑作为一种 非 古典逻辑是与古典逻辑不同类型的逻辑.

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The study of modality may date back to Aristotle, who focused his attention on modal logic.

对情态意义的研究可追溯到亚里士多德时期, 当时的研究重点是情态的哲学概念.

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