短語詞組短語by easy stages 從容不迫地;不遲不疾地;不時停下休息;途中有停歇地Test By Stages 試驗分期migration by stages 段性Operation by stages 分期投產(chǎn)by stages detail 分期Synthetical Algorithm By Stages 階段式綜合算法to control by stages 分期控制teaching by stages 階段教學goals by stages 分期目標 返回 by stages