老师您看看这句话翻译得对吗，不对您帮我改正一下。

　　Graduates sing class songs believing that the friendship they made in school will last a long time

　　at least until their five-year reunion.

　　毕业班长歌行心在学校的友谊将会持续一段时间，至少到五年以后团聚。