Briefly describe the general process of grazing transition of Tianshan herdsmen, and briefly evaluate the benefits of grazing transition.

Process: move from the foot of the mountain to the mountainside in spring and summer, and move from the mountainside to the foot of the mountain in autumn and winter. Reason: As the temperature rises in summer, some snow and ice in Tianshan Mountain melt, forming meadows or grasslands. Herdsmen chase livestock to the mountainside. In winter, the temperature is low, and the snow and ice re-form on the mountainside. Herdsmen move to the foot of the mountain. Benefits: 1 Ensure sufficient food for livestock. 2. Seasonal grassland replacement can reduce the harm of grazing to grassland.