"surname" and "last name" What's the different between "surname" and "last name"?

Job satisfaction or job security Nowadays,a number of people consider that job satisfaction is more significant than job security.But the others suppose that jobs are not always enjoyed by people and a permanent job is much more unaccessible. To be honest,job security plays a priciple role in our lives especially for the elderly.They think that the security jobs can provide a guarantee of life for their children,because they can rely on it.Besides,a security job probably can earn some respect from others such as officers and teachers although the income might not very high.In addition,i suppose a number of people choose these jobs mainly because they do not think they can easily lose these stable jobs,they do not need their jobs to make a lot of money,just make living. Admittedly,job security is very improtant for some people.However, i do not deem that all young people will choose those jobs as they have some fatal disadvantages.As we all know,medical,translation and education costs become higher and higher today.Some security jobs can not provide enough rewards for employees.For young people,one of the most biggest problem is house buying.And i suppose most security jobs are all regular, do not look like challenge,probably clerks will feel boring.So they will not satisfield with their jobs. From my part,it seems that more and more people will choose jobs which they are satisfield with.Firstly,most of these jobs can earn enough money to afford their high costs.And i think it is the most important reason.Secondly,young people are always strict with the freedom of their work.They probably do not like being restricted by their jobs. In conclusion,I suppose that job satisfaction is much more significant than job security.If somebody do not satisfield with his work,he can not do it well,so there is no security to say. (PS: Hi,I'm leonardo from Nanjing ,China , I am going to the UK next year ,this is one of my IELTS writing tasks,but i can't remember the title exactly.It seems like discussing somthing about job satisfaction and job security.I hope i can get some modifies and advice from native speakers,because i am not good at grammer and vocabulary,but time is limted,i have to get a good score before March.And thank you very much!Besides,If you are intrested in China or Chinese,um...welcome to contact me and i am glad to make foreign friends~ )