is it Ok if I bring that one by in a couple of days?by in是什么用法?
L（图书管理员）:
I see you've got some books there.Is that the one you were asked to return?
S（学生）:
No,I left it in my dorm room.These are books I need to check out today.Um…is it Ok if I
bring that one by in a couple of days?