As soon as modal logic came into being, Quine questioned it.

模态逻辑一经产生，就遭到奎因的质疑。

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Here's another one: Modal Logic.

这是另一个，模态逻辑。

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Modal logic is the logic of necessity and possibility.

模态逻辑是关于必要性和可能性的逻辑。

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Modal logic is the logic of necessity and possibility.

模态逻辑是关于必要性和可能性的逻辑。

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