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由骑行者蹬踏驱动的两轮车。具有轻便、易于驾驱等特点,被认为是人们所发明的将人力转化为动力最有效的工具之一。又称脚踏车。
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由骑乘人脚踏驱动的两轮交通工具。又称单车、脚踏车。
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Ethics and the Limits of Philosophy
Ethics and the Materialist Conception of History
Ethics as First Philosophy
ethics-centered
Ethics, Demonstrated in Geometrical Order
ethics for youth
Ethics Guidelines
Ethics in Engineering
ethics in psychiatry
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ethics of photojournalism
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