There are 6 key points you should include in your covering letter:
1.First of all, say that you would like to apply.
比如: I would like to apply for the position of marketing manager…
2.Then you say where you found out about the information about the job.
比如，…which was advertised in Creative Jobs.
3.Say why you would like the job
比如, I have always wanted to work in a leading organisation like the BBC.
4.Say why you are qualified to do the job.
比如，I worked as the sub-editor of University News for two years.
5.Say you can provide more information if necessary.
比如，I would be delighted to provide more information should you require it.
6.Say when you would be available for interview.
比如，I will be available for an interview any time Monday and Tuesday next week.
I would like to apply for…我希望申请…
The position advertised in… 在…广告上刊登的这一职位
If you would like to discuss this in more detail…如果您希望讨论更多细节
I enjoy working under pressure. 我喜欢在有压力的环境中工作。
I was in charge of…我负责…
I was responsible for …我负责…