倚歌产生的时代可上溯至刘宋时代或者更早；
The forming of the Yi song can trace back to the Liu Song period of the Southern Dynasties or earlier.
诸如此者，皆与皇权自刘宋中叶以降渐趋强化有关。
These resulted from the gradual intensification of imperial power starting from the middle period of Song Dynasty.
范晔（398—445）是我国南朝刘宋时期著名的历史学家。
Fan Ye (398—445) is a prominent historian of Liu Song period in the Nan Dynasty.
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