求助英语达人,下面的英语回信需做哪些改动才更合规范,还有措辞,感觉有点质疑人家了,似乎不好,

求助英语达人,下面的英语回信需做哪些改动才更合规范,还有措辞,感觉有点质疑人家了,似乎不好,
Dear Doctor
再加一句话：
Dear Doctor *****,
Thank you for your quick explanation.I truly appreciate your help.I am sorry to consult you once more.Now,I am a little confused that what is ***** in the paper.I try my best to find it in the whole paper,but I still get nothing.In the designing of a *****,isn't to prove the finite convergence of *****and ***** to zero?Could you explain a little bit about this please?Thanks a lot.
Look forward to hearing from you.
Best Regards,
*****