salary是指非体力劳动者所得到的“工资、薪水”，通常按月，有时按季或年计算。而且是指基本工资。 （Salary is usually paid monthly,sometimes three months or a year,for a job,esp.as for workers of higher skill and rank）
income一般是指总收入或进账,比较口语化,可以用在个人,也可以用在企业；对一个人来说你的income是salary, bonus和allowance的总和。
wage指简单劳动或体力劳动者所得的“工资、工钱”，通常按周、日等短期计算发给，常用复数形式。（Wages are paid weekly for a job,esp.as for labourers or workers.）
pay指不论工作性质如何，针对劳动所支付的报酬，它包含salary和wage（s）（pay is paid for a job），为不可数名词。
一篇小议论文：
Salary or Interest
Upon graduation, virtually all college students will confront the problem of the career choice. It is truly a tough choice. Students‘ opinions differ greatly on this issue. Some hold that priority should be given to their interest in jobs, but others take the attitude that salary is the most critical factor influencing their career choices.
As to myself, I prefer the latter view. A well-paid job exerts a tremendous fascination on a great number of people, with no exception to me. Although it might be impossible to measure the value of one’s job in terms of money, salary counts most when I choose my future career. In my view, our career choices largely depend on how and where we have been brought up. I come from a poor urban family and my parents were both laid-off workers. In order to finance my tuition, they have been working hard over the past four years. As the only son in my family, I have to shoulder the burden of supporting my family.
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