saddle-back

例句：

1. 1.The horse was ridden on the saddle-back.
   那匹马被骑在鞍背上。
2. 2.The old man sat on the saddle-back and watched the sunset.
   老人坐在鞍背上看着日落。
3. 3. The horse's back was sore from the long journey.
   这匹马长途旅行后背部很疼。