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

I'm writing to show my sincere appreciation for the book you gave it me before you left China.

你在离开中国之前给我送了那本书，谨写此信以表达我衷心的感谢。

youdao

I am writing to offer my sincere congratulations to you on your winning the first prize in the Chinese Chess Network Challenge.

我写这封信是为了衷心地祝贺你赢得了中国象棋网络挑战赛一等奖。

youdao

"My prayers for a fast recovery as well as my sincere thanks of an outstanding job, " one person wrote.

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Those of you who work inside organizations and have to go through this every day have my sincere sympathy.

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My sincere hope is that whatever specific treatment route you follow, you will start feeling like yourself again as quickly as possible.

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