It means that neither player has an incentive to deviate from that point.

意味着每个参与人都不想偏离那一点

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Who can deviate and do better here?

谁能偏离并且胜过他

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Who has an incentive to deviate?

谁有偏差的可能性

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So Allen is saying if Player I is choosing this strategy and Player II is choosing her corresponding strategy here, neither player has an incentive to deviate.

艾伦认为如果参与人I采取这个策略,而参与人II采取了相应的策略时,没有人想要改变这种状况

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