What do you mean cicadas sing in the summer solstice?

An Analysis of the Significance of Summer Cicada Singing at the Beginning of the Solstice

The ancients believed that the antlers were born forward and the orientation belonged to Yang. In summer, it is the longest day of the year (northern hemisphere), so in summer, Yang reaches its peak, but the two extremes meet. After the summer solstice, the yin begins to sprout and the yang begins to decline, so the antlers symbolizing the yang begin to fall off, which is called "antlers solution".

After the summer solstice, careful friends will find that cicadas sing more. Cicadas can often be heard in summer, but cicadas don't appear all summer, and only gradually increase after the summer solstice. This shows that after the summer solstice, the vegetation gradually becomes moist, suitable for the survival of cicadas, and naturally begins to move. This is the "beginning of cicada" and "strip". It is a cicada, so it is the "beginning of cicada"

When cicadas are singing more and more, some wet shrubs and ferns will be fumigated by hot air before and after Xiaoman and die or "sleep". But in the damp wetland, plants such as Pinellia ternata will start to sprout instead, which is "Pinellia ternata".