(Mainland China) the three tasks of summer farming: planting, harvesting, and field management
three months of summer
The three months of the summer season according to the lunar calendar, specifically the fourth, fifth, and sixth months; also used to refer specifically to the sixth lunar month
three years
(Literary) a period of three years, literally 'three summers'
Three Xia
(Literary) a collective name for three ancient ritual songs used by the emperor to entertain feudal lords