I am writing to express my sincere gratitude for your help in my study.

我写这封信是为了感谢你在学习上对我的帮助。

youdao

Let me extend my sincere gratitude for sending my lost daughter home.

请允许我对你把我走失的女儿送回家表达感激之情。

youdao

There are not enough words to express my sincere gratitude to my parents.

没有更多的言语能表达我对他们的真诚感念之情。

youdao

It is with sincere gratitude that I accept this Cesar Chavez Champions of Change Award.

WHITEHOUSE: We Choose Hope

Without a sincere sense of gratitude, sharing credit is just another manipulative trick bound to backfire.

FORBES: Giving Away Credit; Is It Worth It?