晚上,我常看到骑自行车的人在车流里穿来穿去,在较黑暗的地方,汽车司机稍不注意就很难看见,从而增加了骑车人的危险,很容易造成交通事故。于是,我想给自行车设计一个警示灯。我设计的自行车自发电闪流灯需要吸铁石、线圈和发光二极管,把 In the evening, I often see cyclists wearing clothes in the traffic. In darker places, the driver of a car is hard to see with little attention. This increases the risk of a cyclist and can easily lead to traffic accidents. So, I want to design a warning lamp for the bicycle. I designed bike self-powered flashlight which needs magnet, coil and LED to put