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.
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.
刘宋时期梅雨期到来的早晚和降水量的多少，受制于这种气候波动，同时也影响到当时水旱灾害的发生状况，是这种气温波动的集中表现。
The time and precipitation of Meiyu were controlled by the fluctuation, and it would influence the condition of floods and droughts, this is the concentrated expression of temperature fluctuation.
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