1.Rose and Galen were nearly knocked from the path when a riderless, wild-eyed horse galloped by.
一匹无人驾驭的马儿疯跑过来，差点就把萝丝和加仑撞出小路。
2.A single horse, Comanche, survived and for many years thereafter appeared in 7th Cavalry parades, saddled but riderless.
只有一匹马，卡曼奇，幸存下来在很多年以后出现在第七届骑兵游行上，它戴着马鞍但却没有骑手。
3.The best known riderless horse was "Black Jack" .
最出名的空马叫“黑杰克”。
4.The horse came back riderless.
那匹马无人骑而自己回来。
5.Research Summarization of Riderless Bicycles
自行车机器人研究综述