buckstay

例句：

1. 1. Thehorse was buckstaying on theback of the rider.
   马在骑手的背上颠簸。
2. 2. The stable master had to fixthe buckstay before the race.
   赛跑前，马厩主人必须修理鞍座。
3. 3. The jockey rode witha buckstay in his hands.
   骑师用手握着鞍座骑马。