If the first two professors are wrong, and include the ice-cream anecdote in their course notes, they set a precedent that it is irrational to ignore.

• 如果头两位教授是错的，并把这件冰激凌逸闻写进他们的课程笔记里，他们就开创了一个先例，而人们如果忽视这个先例，就显得不理性了。