“异想天开怎么讲?”老师的问话刚落音,小明就举手抢答:“批评人考虑问题思路怪异,不切实际,难以实现,是个贬义词。”老师肯定了小明的回答,又补充说:“这是一个成语,过去确实用于贬义;但现在的用法有所变化,也有用于褒义的了。”接着,老师讲了一个异想天开的故事。美国有两个青年,一个叫柯亨,一个叫 “Whimspeaking how to speak?” The teacher’s questioning has just fallen, and Xiaoming raised his hand to answer: “It is a pejorative sense for critics to consider the problem as weird, unrealistic, and difficult to implement.” The teacher affirmed Xiaoming’s answer and added that : “This is an idiom. It used to be derogatory in the past. However, the usage has changed and it has also been used for defamation.” Then, the teacher told a fanciful story. There are two young people in the United States. One is Cohen, and the other is called.