There are many rules in our society.Rules make our life better.
For example,you are not supposed to smoke in publice.It's necessary.Because it may make others feel uncomfortable.Another instance is that you shouldn't litter about.We should protect our environment so that our Mother Earth will be more and more beautiful.You are not supposed to sneeze or speak loudly in public.If you do ,others will regard you as an impolite person.
Follow the rules,and make our life more comfortable.