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,
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