bicycle that has two wheels of equal size; pedals are connected to the rear wheel by a multiplying gear 同义词：safety bike,
A safety bicycle is a type of bicycle that became very popular beginning in the late 1880s as an alternative to the penny-farthing or ordinary and is now the most common type of bicycle. Early bicycles of this style were known as safety bicycles because they were noted for, and marketed as, being safer than the high wheelers they were replacing.
您当前位置：