in your class,your teacher shows you the following picture .

In the picture,there are two people arguing over how many sticks are between them.One person say there are four sticks.The other person say there are three sticks.However,they both just counted the sticks from the side that is closer to them.They should also check the other side and separate the sticks and count them.So the most important thing isn't what people see,but what things really are.
在图片里,有两个人在争论他们中间有多少根棍子.一个人说有4根,另外一个人说有3根.但是,他们都只数了离自己近的那一边的数量.他们应该也检查一下另外一边而且把棍子分开了数.所以,重要的不是人们看见什么,而是事实究竟是什么.