And let me make the assumption that all the mass of the bicycle wheel is at the circumference, which is not very accurate, but it's close to that.
让我设个假设，所有的车轮的物质是在，圆周上的，并不是很准确，但很接近的。
So, that means that this distance on the road is actually equal to the distance here on the circumference of the wheel.
这就意味着，这段距离，等于车轮边缘的这段距离。
And, now, let's mention that we have a point that's been painted red on the circumference of the wheel.
现在，我们有一个点,这个点在车轮边缘，它被涂上红色。
The large circumference of the penny-farthing's front wheel carried it farther and faster than anything that preceded it, much as China's economy has grown faster for longer than its predecessors.
“大小轮车”前轮的大轮径把车带得更远更快，超越了先前的任何东西，很像中国的经济，其成长快过先前时期，增长时间也更长。
Large quantities of raster lines radial-arrayed along the circumference in the raster wheel are drafted on a photoelectric plotter film directly with the photoelectric draft technology.
光栅轮中沿圆周径向排列的大量光栅线是采用光电绘图技术直接绘制在光电绘图仪胶片上形成的。
The circumference of a seeding wheel is provided with an axial groove, and the inner part of the axial groove is provided with a slide block whose axial position can be adjusted.
播种轮的圆周上设有轴向槽，轴向槽里装有可调整其轴向位置的滑动块；
The circumference of a seeding wheel is provided with an axial groove, and the inner part of the axial groove is provided with a slide block whose axial position can be adjusted.
播种轮的圆周上设有轴向槽，轴向槽里装有可调整其轴向位置的滑动块；
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