Dear_____,
Thank you for your guidance, friendship, and discipline. Thank you for creating an environment of enthusiam for learning, appreciating for growing, and room for making mistakes along the way. We are all grateful to have you as a guide, leading by example.
也可以说：Thank you for all the extra efforts you make to help us grow, and the challenges you encourage us to face to help us become who we are.
Sincerely,
______
另外，恭喜毕业！
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