《book of days》是Enya演唱的一首歌曲，收录于《the very best of enya》专辑中

三元组：
predicate: 歌手
object: enya
subject: book of days
predicate: 歌手
object: Enya
subject: book of days
predicate: 所属专辑
object: the very best of enya
subject: book of days