How to write the preface of class corpus?

I had an unforgettable time in this school. I believe that in everyone's life, there will always be an unforgettable memory, just like a shining shell lying quietly on the beach of time, lasting forever. And my years at school are the brightest shells. Here, there are my laughter, my tears, my initial youth, my favorite teacher and my best friend, laughing and laughing all the way. I still remember the jokes told by XX at the get-together, the appearance of the monitor when he was in charge of his work, the bittersweet aspects of military training, the words and deeds of my favorite classmate XX, the concern of my parents, and the teaching and encouragement of my teacher. Here are my most unforgettable things, my little blessings, my growing footprints and unforgettable theme class meetings. How can such a school life not be my most cherished shining shell? This is where my dream began.