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某些案例显示反事实条件句(counterfactual conditionals)是有“内在歧义的”(inherently ambiguous),即同一句反事实条件句既可以表达“前进式反事实条件句”(forward-tracking counterfactuals)也可以表达“回溯式反事实条件句”(back-tracking counterfactuals).在之前的文章中(Lee2015,Lee2016),我提出一个因果模型反事实条件句语义学(causal modeling semantics of c