In those years, we played Super Mario on the red and white machines, and we fell asleep in the long math class. The time that we can't get back is always engraved in the depths of our hearts; many years later, we all have a future that we never expected, and there was never a promise, but you have always been in a soft corner of my heart. Clean campus time, I would like to dedicate this document to the missing and special person in our hearts.