Dear Professor [Last Name],
It is with great sadness that I write to inform you that I will be leaving [University Name] at the end of this term. This is not an easy decision, as I have truly enjoyed my time here and the knowledge I have gained under your guidance.
I still remember the first day I walked into your classroom, eager to learn and improve my English skills. Your passion for teaching and your dedication to your students have inspired me to work harder and achieve more. You have been an incredible mentor, and I am grateful for all the help and support you have given me.
During my time at [University Name], I have had the opportunity to participate in various activities and projects that you have organized. These experiences have not only enriched my academic life but have also allowed me to grow as a person. I am especially thankful for the opportunities you have provided me to showcase my abilities and learn from my peers.
As I prepare to embark on this new chapter in my life, I want to express my deepest gratitude for everything you have done for me. Your teachings and guidance will continue to influence me, and I will always cherish the memories of my time at [University Name].
Thank you once again for being an outstanding professor and a wonderful friend. I look forward to the possibility of staying in touch and wishing you all the best in your future endeavors.
Yours sincerely,
[Your Full Name]
[Date]
建议：
个性化：
根据你与教授的关系和具体的经历，适当调整信中的内容和语气，使其更具个性化和真诚。
简洁明了：
尽量保持信的内容简洁明了，突出重点，避免冗长和复杂的句子结构。
感谢与祝福：
在信中表达对教授的感谢和祝福，展现你的真诚和礼貌。
结尾：
在结尾处再次表达感谢，并签上自己的名字和日期。