脱轨器，转撤器通过在不同大小的扣链齿轮间移动链条而转换自行车齿轮（换档）的装置 A device for shifting gears on a bicycle by moving the chain between sprocket wheels of different sizes.
人体模型如真人大小的、全身或半身的人体模型，用于量试衣服是否合适或展示服装；人体模型 A life-size full or partial representation of the human body, used for the fitting or displaying of clothes; a dummy.
