逐次

逐次	zhú cì	gradually / one after another / little by little
逐	zhú	(bound form) to pursue; to chase; to drive away / one by one; individually
次	cì	next in sequence / second / the second (day, time etc) / secondary / vice- / sub- / infra- / inferior quality / substandard / order / sequence / hypo- (chemistry) / classifier for enumerated events: time