how to write a cover letter after revision

和第一次有区别了，修回时的cover letter首先感谢编辑和审稿人的意见，然后说明自己已经作了相应的修改，最后附上response to reviewers。
examples 如下：
example1来自丁香园，example2仍是马兰教授讲稿
Exampie 1
Dear Dr. xx,
Thank you very much for your email of January 20, 2006, with regard to my manuscript (Ms. Ref. No.: xxx) together with the comments from the reviewers. According to the comments, we have revised the relevant part in the original manuscript. We also responded point by point to each reviewer comment as listed below, along with a clear indication of the location of the revision. We hope that the revised manuscript is acceptable for publication.
Thank you very much for your continued attention.
Cordially,
xxx
Response to reviewers:

Example 2
Dear Editor:
We were pleased by the positive evaluation that our manuscript received from the editor and the reviewers. We carefully read their comments and suggestions and have now completed a revision of the manuscript that addresses their concerns. As you will see in the revised manuscript, the data of lower dose of NaBu have been included and new experiment of food-reinforcement has been carried out as suggested. Thorough and extensive revisions have been made throughout the manuscript following the suggestions from the reviewers. We thank the reviewers for their constructive suggestions that have improved both the quality and the clarity of the manuscript and we believe that the revised paper is now acceptable for publication in Neuropharmacology.
Sincerely,
***, Ph.D.
Pharmacology Research Center
Fudan University
Our point-to-point response to the reviewers’ comments:
Review #1:
1. The manuscript has been proofread thoroughly to correct grammar and spelling errors.
2. Data obtained using 100 mg/kg NaBu have been included in the revised paper as new panels of Fig. 1 (Fig. 1A and 1B) according to the reviewer’s suggestion. We found that …
…
Review #2:
1. Following the reviewer’s suggestion, we have performed …
2. …