模板2：

　　Dear ，

　　I am writing to express my views concerning . In the first place, I would like to say thank you for the help and everything else you have been offering to us. Meanwhile, I also want to make some advice to better .

　　Firstly, we have found that . Secondly, we want to . Finally, we hope that .

　　I am looking forwards to your consideration about my proposals. Thanks in advance for that.

　　Yours sincerely,