Singing pigeons are blowing feathers and flying, and their wings are lined up, even when agriculture is in an emergency. "What solar terms are described?"

Describe the three solar terms in Grain Rain:

Grain Rain: At the beginning, Ping was born.

The second time, the pigeons flapped their wings and flew, their wings lined up, and the farmers were in a hurry.

Third, Dai Sheng dropped a mulberry, a bird weaving a net, wearing a snipe, appeared in the mulberry to show the silkworm wife, so the woman was prosperous and wearing a snipe.