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.
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 the early years of the 19th century, farmers in western Pennsylvania kept their wagon wheels greased with puddles of bubbling muck that studded the countryside.
在19世纪早期，西部宾夕法尼亚州的农民都给自己的马车轮子抹上乡下随处可见的气泡肥料胶土。
The Camaro has 20-inch wheels, which were nearly unheard of on mass-market cars a few years ago.
Camaro的车轮有20英寸，几年前这在大众市场上还是闻所未闻的。
Disk brakes, used for years for front wheel application, are fast replacing drum brake on the rear wheels of modern cars.
在汽车前轮上应用多年的盘式制动器正快速的取代鼓式制动器应用于更新式的汽车上。
Years of grinding wheels was rolled forward to the soul, into the sense of excitement and agitation.
被岁月的车轮碾轧着的灵魂，注入了莫名的兴奋和激动。
Years of grinding wheels was rolled forward to the soul, into the sense of excitement and agitation.
被岁月的车轮碾轧着的灵魂，注入了莫名的兴奋和激动。
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