What does summer heat mean?

It means that the slight summer heat and the great summer heat are connected.

The whole sentence is "summer people are connected with summer heat", which refers to long summer, small full, awn seed, summer solstice, big trees and small trees. "Slight summer heat" is introduced: it means "slight heat", which means that although we can already feel the heat of the weather at this time, it has not reached the hottest time of the year, just the beginning of a hot summer day. Introduction to "Big Summer": The last solar term in summer is a festival that reflects the degree of summer heat, indicating that the weather is extremely hot.

The origin of "midsummer, midsummer, midsummer" is twenty-four solar term song, in which solar terms refer to twenty-four seasons and climate. In order to conveniently remember the 24 solar terms in the ancient calendar of China, many versions of a poem were circulated.