有一则报道讲述了一个完全失明的男孩，可以用面部视觉围绕他家附近的楼栋快速骑三轮车。
One report tells of a totally blind boy who could ride his tricycle at good speed round the block near his home, using facial vision.
我们的儿子刚刚从骑三轮车过渡到骑普通自行车了。
Our son has just graduated from a tricycle to a proper bicycle.
他建议患者骑三轮车，或使用固定脚踏车或训练器——这是设备将公路自行车转变为原地脚踏车。
He recommends that patients ride tricycles, or use stationary bikes or trainers - devices that turn road bikes into stationary ones.
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