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

periodizations 是名词 periodization 的复数形式。periodization 由词根 period（时期）和后缀 -ization（...化）组成，字面意思是"时期划分"或"分期化"，在历史学中特指"历史分期"或"时期划分"的方法。