ultimate wheel
名词 n.
英文释义
名词 n.
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A type of unicycle without a frame or seat, consisting of only two pedals attached to a wheel.
— It is also interesting to note the number of different types and designs of cycles, including the so-called “ultimate wheel”—a wheel with pedal arms and pedals but no frame or saddle or handlebars.
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数据来源: Wiktionary