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.
五段论犹如在小孩子在学习骑脚踏车的时候，使用辅助轮，它是帮助人们学习的工具。
Writing a five-paragraph theme is like riding a bicycle with training wheels; it's a device that helps you learn.
那男孩蹬着三轮脚踏车走了。
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