Dear ，
I am writing to extend my sincere gratitude for (感谢的.原因). If it had not been for your assistance in (对方给你的具体帮助), I fear that I would have been (没有对方帮助的结果).
Everyone agrees that it was you who (给出细节).
Again, I would like to express my warm thanks to you! Please accept my gratitude.
Yours sincerely，
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