1·In the preface to her book, Levin suggests a counterfactual history, a history with a League of Nations that included the United States.
莱文在书的前言中提出一个反事实的历史，一个有包括美国在内的国际联盟的历史。
2·Special versions of Bayesian networks, as it turned out, can manage causal and counterfactual relationships as well.
结果，特殊的贝叶斯网络还可以处理因果关系和反事实关系。
3·Counterfactual statements are the building blocks of scientific thought and moral behavior.
反事实表达是科学思考、道德行为的基础。
4·Predicting the future is a form of forward counterfactual thinking.
预测未来是一种事前反事实思考。
5·The third part mainly introduces different implication theories, including: material implication, strict implication, relevant implication, counterfactual implication and intuitive implication.
第三部分主要介绍不同的蕴涵理论，如实质蕴涵、严格蕴涵、相干蕴涵、反事实蕴涵和直觉主义蕴涵等。