a period of time that is part of a particular longer period of time

We divided the study into three periods: the entire 12-year period, the most recent 6-year subperiod and the most recent 3-year subperiod . 我们将研究分为三个不同的周期：12年为全周期、近6年和近3年皆为次周期。

Just like the main periods, each sub-period is characterized by the particular qualities and significations of the ruling planets. 每个子周期的特点正如同主周期，是依其统治行星的特性和意义而定。