历史学家们经常将中国古代历史划分为不同的时期，如先秦、秦汉、三国和唐宋时期。

Historians often divide ancient Chinese history into distinct ___periodizations such as Pre-Qin, Qin-Han, Three Kingdoms, and Tang-Song periods.

根据赛程，教练制定了详细的训练周期化方案。

Based on the competition schedule, the coach developed a detailed ___periodization plan for training.