讲一下salary和wage的区别和各自用法.

Salary,wage和pay这三个词都可以表示“工资”,但其含义不同.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（Salary is usually paid monthly,sometimes three months or a year,for a job,esp.as for workers of higher skill and rank）；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（Wages are paid weekly for a job,esp.as for labourers or workers.）,常用复数形式；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.