文章认为，极端实在论和极端唯名论的可能世界学说都是错误的，真正具有可行性的可能世界学说应是温和的实在论。

The dissertation holds that possible worlds doctrines of extreme realism and extreme nominalism are both mistaken, and that the really feasible one should be moderate realism.

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另外，由于可能世界的这一特殊本体地位，新的温和模态实在论并不存在区分可能世界与不可能世界的问题。

In addition, for the special ontological status of possible worlds, there is no problem of distinguishing between possible worlds and impossible worlds.

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