Dear Mr. Peterson， With our visit to France coming to an end, we are leaving for China soon. On the moment of leaving, I feel very pleased to write to you, on behalf of my fellows and in my own name as well. to express to you our deep thankfulness for the hospitality(款待)that you have given us during the short stay in France. I am sure that this visit will be helpful to the further development and strengthening of our cooperation(合作)in the area of medicine. My fellows and I are all looking forward to the opportunity of meeting you in China in the near future. so that both sides could examine once again how we might work more closely together in order to make the relation between us a step forward. Meanwhile, please accept our best wishes for your good health and success in your career. Yours sincerely, (Signature) What is the purpose of the writer during the short stay He will be ready to give his cooperation to______.