A：Our philosophy teacher is very humorous.
我们的哲学教师很幽默。
B：I usually have the wrong notion that he's very serious.
我总以为他很严肃。
A：No,not at all.The examples he gives are very interesing.
不，一点也不。他的例子非常有意思。
B：No wonder when I pass your room,I always hear your laughter.
怪不得我每次经过你们教室都听见笑声呢。