光伏逆变器接线原理图:请问如何写英文的cover letter?

cover letter指的是投稿信，

cover letter的内容主要包括：）
应该简述所投稿件的核心内容、主要发现和意义，拟投期刊，对稿件处理有无特殊要求等（如“not to review” list）。另外，请附上主要作者的中文姓名、通讯地址、电话、传真和e-mail地址。此外有的杂志要求推荐几位审稿人及其联系方式。以及谁已经阅读过该文。

常用模板：即：结构、一般的句式有以下几种：
（1）
Cover letter
Dear Mr. **
1. The work described has not been submitted elsewhere for publication, in whole or in part, and all the authors listed have approved the manuscript that is enclosed.

2. I have read and have abided by the statement of ethical standards for manuscripts submitted to Neuroscience.

kind regards.
Your sincerely,
通讯作者

（2）
Dear Dr. 主编name:
We submit our manuscript entitled " 文章title" to 杂志名for publication.
接着简单介绍你文章的主要创新点和意义，不易过多，但要突出新意和关键点。
All authors have seen the manuscript and approved to submit to your journal.
Thank you very much for your attention and consideration.

Sincerely yours,
通讯作者

（3）
Dear Dr. 主编name:
We submit our manuscript entitled " 文章title" to 杂志名for publication.
接着简单介绍你文章的主要创新点和意义，不易过多，但要突出新意和关键点。
All authors have seen the manuscript and approved to submit to your journal.
Thank you very much for your attention and consideration.

Sincerely yours,
通讯作者

（4）Dr. ***
Editor-in-Chief, ***
(add address) January 22, 2003

Dear Dr. **,

Enclosed herewith please find 3 copies of a MS by: ‘***. *** and ***’ entitled: “**********”, which we would like to submit for publication in the ‘******'.

Looking forward to your decision,
With kind personal regards,
Sincerely yours,

Cover letter 并非专指投稿信，应是附带说明文件。对寄上的东西作一简单介绍。如寄回物件维修说明文件，

Dear Sir.

Enclosed is the ( 物品名), which I believed is faulty and require either repair or replacement under the term of warranty agreement.

The problem are (列出故障点).

Any problem regarding to the above issue, please contact me.

Your Sincerely.