Conclusion: Ah, dear students, although I have left you, those memories like songs will be engraved in my heart forever.
Beginning: There is a kind of friendship called missing, and there is a kind of friendship called unforgettable. Dear classmates, do you know that I am far away, remembering the good years with you?
End: Friendship is a song, friendship is a glass of wine, and friendship is a river. Unforgettable dear classmates, unforgettable sincere friendship.