C33 A Bug That Only Exists in Legends

"Zhang Dekai, how did your son get infected by the black bugs?" Old Man Zhao asked.

He took a deep breath and said slowly, "This happened on the Crosscut Mountain three months ago. On the morning after a heavy rainstorm, the two of us went up the mountain to visit the medicinal plants, perhaps because of the heavy rain, but the soil on the mountain was very soft, and from time to time