jockey roller

例句：

1. 1. The jockey roller is used to control the speed of the horse during the race.
   骑师滚轮用于控制赛马的速度。
2. 2. The jockey roller helps the jockey to keep the horse in line during the race.
   骑师滚轮帮助骑师在赛马比赛中保持马匹的直线。
3. 3. The jockey roller is a crucial part of the racing equipment, ensuring that the horses are stable and controlled during therace.
   骑师滚轮是赛马装备中至关重要的一部分，确保马匹在比赛中稳定且可控。