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伏日也称伏天。“夏至”后第三个庚日入初伏,故有“夏至三庚入伏”之说;第四个庚日入中伏、“立秋”后第一个庚日入末伏。初伏、中伏、末伏总称“三伏”。初伏、末伏都是10天;中伏有时10天,有时20天。如果,“立秋”在“夏至”后的第四个庚日后, 中伏为10天;“立秋”在夏至后的第五个庚日后,中伏为20天,也就是说末伏必须在
V day is also called V days. After the “summer solstice”, the third day of Gengri into the beginning of volts, it is “Summer Solstice Geng into volts,” said; the fourth G day into the volts, “Legislative autumn” after the first G day into the last volt. Initial volts, in the volts, the end of the general term “volts.” The initial volt, the final volt is 10 days; the volt sometimes 10 days, sometimes 20 days. If, on the fourth day after the “Summer Solstice”, “Liqiu” will have a median depression of 10 days, “Liuxiu” will have a median depression of 20 days after the fifth G day after the summer solstice, that is,