已經失去的，留作回憶。

Don't forget the things you once you owned.
Treasure the things you can't get.
Don't give up the things that belong to you and keep those lost things in memory.

曾經擁有的，不要忘記。
不能得到的，更要珍惜。
屬於自己的，不要放棄。
已經失去的，留作回憶。