"this should be a cave dug by the nomadic people on the grassland." Seeing Chu zhaoyue's curiosity about why there is such a large cave under this grassy hill, Zhan Wuya sits on the ground of the cave a little breathlessly and begins to analyze, "because when grazing on the grassland, he often encounters some extreme weather, such as what, hail, gale, sand dust and so on. When encountering these weather, if Just outside grazing, but no time to go home, the herdsmen will drive the herding sheep and herds to some grassy hills and earth hills. In order to prevent this from happening, they have dug caves for shelter....