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著名的德国宝马汽车公司推出的系列环保概念的自行车,是宝马汽车工艺中车体设计与机械原理的经典之作。宝马全系列自行车不仅在制造过程中
The series of environmentally-friendly bicycles introduced by the famous German BMW company is a classic of the car body design and mechanical principle in the BMW car process. BMW’s full range of bicycles not only in the manufacturing process