Dear __________,
I am writing to inform you about the decision to resign from my current position. There are a few factors involved.
First and foremost, __________. Secondly, __________.. Last but not last, __________..
I would like to take this opportunity to express my gratitude for the rewarding experience that I have enjoyed during my employment.
I sincerely wish you could approve of my resignation, and I apologize in advance for any inconvenience thus caused.
Sincerely yours,
Li Ming