The most people only pay their attention to themselves or their family in our socity .We can't say it is not right ,for this is the way of human being.
Though I find there are so many problem I can't resolve by myself .we must learn more knowledge with modern science and technology developing.However ,our ability is limited.For example ,if you are an engineer ,you maybe not know the knowledge about medicine.if you are a doctor ,you maybe not know agriculture.
As a modern people ,we seem become ignorant ,for there are more thing which fulls of marvels and wonderful .If we have not friends who come from different trades. we may really become unwisdom.
You will be sure to agree if I give an example ,that is going to see a doctor .if you nither know about medicine or a friend in hospital.you have to do anyhing that the doctor told you. Just for you don't know.so different trade friends is very import ,only like this we can know which is right or wrong,even how to do .
So we should make friends with different trades,whatever they are old or young.