中伏[zhōng fú ]
词典the second of the three ten-day periods of the hot season：中伏；二伏。
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词典the first day of the second period of the hot season
中伏[zhōng fú]
（从夏至后第四个庚日到立秋后第一个庚日） the second of the three ten-day periods of the hot season (sometimes lasting twenty days instead of ten)