on the face of it

Từ điển Oxford Advanced Learner 8th

on the ˈface of it idiom
(informal)used to say that sth seems to be good, true, etc. but that this opinion may need to be changed when you know more about it
•On the face of it, it seems like a great deal.
•What may, on the face of it, seem obvious often turns out to be far more complicated.
Main entry: ↑face_idiom