阶段的近义词、同义词

an amount of time; "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period"

any distinct time period in a sequence of events; "we are in a transitional stage in which many former ideas must be revised or rejected"

a specific identifiable position in a continuum or series or especially in a process; "a remarkable degree of frankness"; "at what stage are the social sciences?"