The person who always makes me laugh is my professor XXX.When we are confused in his lecture,he always tells a joke that make us relaxed.Even in his presentation in some important conference,he also can say some funny things that make audience happy.
The reasons why he keeps this quality are:firstly,he always lead a positive life.This attitute offers him confidence to make everything easy and smile to his life.secondly,as a professor,he strategicly proposes to create a relaxed atmosphere for students to study.Accompainied with his funny teaching,we spent many many interesting and efficient classes.