在世界的一些地方，骑自行车的人已经通过叫自行车发电机的装置产生了多年的安全电能。当自行车车轮转动的时候一个装在上面的发电机就会产生交流电。
In some parts of the world, cyclists have been powering safety lights for years with devices called bicycle dynamos, which use a generator to create alternating current with every turn of the wheels.
他们将一辆自行车改造成了发电机，还造了一台洗衣机、一块太阳能电池板，以及一台小型风机。
They converted a bicycle into a generator and built a washing machine, a solar panel and a small wind turbine.
我用自行车架，旧自行车马达，建造了我的发电机。
Using a bicycle frame and an old bicycle dynamo, I built my machine.
电动自行车前轮装置的两个发电机在同一根轴上，车轮在两个发电机之间旋转。
Two generators of the front wheel device are installed on the same shaft, the wheel rotates between these two generators.
电动自行车前轮装置的两个发电机在同一根轴上，车轮在两个发电机之间旋转。
Two generators of the front wheel device are installed on the same shaft, the wheel rotates between these two generators.
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