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模板2： Dear ， On behalf of , I would like to extend our most sincere gratitude for . We appreciate greatly your aid in not only , but also . It is said that your that we could enjoy such a wonderful trip / arrive at such splendid achievements, and we will never forget your painstaking labor and full cooperation / warm hospitality. With this letter we would also like to formally invite you to , so that . WE look forwards to hosting you . With personal regards. Yours sincerely, | 
