millennian
例子
The historian specialized in millennian studies, focusing on how societies evolved over a thousand-year span.
这位历史学家专门研究千年研究，专注于社会在千年跨度内是如何演变的。
The geological changes occurred over a millennian timescale, slowly reshaping the landscape.
地质变化发生在千年时间尺度上，慢慢重塑了景观。
