Dear Dr. Joe:
Thank you very much for taking time to edit my writing and for your great encouragement. The more I read your comments, the more I felt the loss that we will have without your teaching.
Honestly, I really learn that editing and re-writing can always refine a paper. I thought I don't have much to change after the first edition. Now I see the subtle modifications really show the beauty of English and the capability one can have in handling the language.
Many thanks again. Hope you can teach us soon.