承蒙鼎力相助，不胜感激，谨备薄礼，敬请笑纳。
Please accept this gift in appreciation of all you've done for us.
多蒙鼎力相助，不胜感谢。
We are extremely grateful to you for the trouble you have taken on our behalf.
我由衷地希望在今后的岁月里能继续得到你们的鼎力相助。
I sincerely hope that I can continue to count on your generous support in the months and years ahead.
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