I don't think teachers should always be funny. Not all subjects are suitable for humor, and some students might find it distracting. Teachers need to maintain authority and respect in the classroom, and too much humor can undermine that. Also, jokes can sometimes be misunderstood or even offend students, so it's important for teachers to focus on delivering content effectively rather than trying to entertain.
我认为老师不应该总是搞笑。不是所有的科目都适合幽默,而且有些学生可能会觉得分心。老师需要在课堂上保持权威和尊重,过多的幽默可能会削弱这一点。此外,笑话有时可能被误解甚至冒犯学生,所以老师更重要的是专注于有效传达内容,而不是试图娱乐。