正确表达应该含有定冠词：
the days of chasing our dreams
or
the days when we chased our dreams
or
the days in which we chased our deams
祝你开心如意!但有一本书叫<<清华北大不是梦>>封面上面写的是days of chasing dream,我觉得甚是奇怪,这样说书上写得不对吗?谢谢With best wishes!