教师释疑： Entailment: It is basically a semantic relation (or logical implication), and it can be clarified with the following sentences:a. Tom divorced Jane. b. Jane was Tom’s wife. In terms of truth value, the following relationships exist between these two sentences: when A is true, B must be also true; when B is false, A must also be false. When B is true, A may be true or false. Therefore we can say A entails B.
