When and where are the earthworms unearthed?

Hehe, it's not a matter of time. The weather is like this: Earthworms generally live in the soil and breathe the air in the soil by moist skin. It is raining. The soil in Tianshui is full of cracks, the air is squeezed out, and the earthworm can't breathe, so it climbs out of the ground. But it is dangerous. Once the weather clears up and the ground is dry, earthworms will suffocate and die because they can't go back in time, so they appear on the ground. You got it?