伴你从校服到婚纱陪你从学校到婚姻
[bàn nĭ cóng xiào fú dào hūn shā péi nĭ cóng xué xiào dào hūn yīn]
It describes a romantic notion of staying together through many milestones - starting as classmates and eventually becoming partners for life. The meaning is very sweet yet simple.