Happy Teacher's Day!

祝教师节快乐！

Here are a few more options:

Thank you for your hard work and dedication as a teacher. Happy Teacher's Day!

感谢你作为一名教师的辛勤工作和奉献精神。祝教师节快乐！

Your guidance and support have made a lasting impact on me. Happy Teacher's Day!

你的指导和支持对我产生了深远的影响。祝教师节快乐！

You are a true inspiration and role model. Happy Teacher's Day!

你是真正的灵感和榜样。祝教师节快乐！