riderless

音标发音

The best known riderless horse was Black Jack.
最有名的无人骑的马要数黑杰克。
Their riderless contraption, which sports two extra backwards-rotating wheels and a front wheel that touches the ground in front of the steer axis, can still coast stably.
他们的没有驾驶者的新发明，安装有两个反转的轮子，在转向轴之前还有一个触地的轮子，这样在滑行状态也能稳定。
Internal and overseas research actuality was summarized in this paper, existent problems was analyzed, and then primary development direction of riderless bicycles was presented.
本文综述了国内外的研究现状，分析了所存在的问题，并指出了自行车机器人未来的主要发展方向。