acknowledge one's debt to one's teacher
感谢老师

-Congratulations! You finished top in the final examination.
-恭喜恭喜！你在期末考试中取得了第一名。
-Thank you very much. I don't know what to say. I want to acknowledge my debt to my teacher first.
-谢谢，我都不知道说什么了。首先我得感谢老师。