So the point on the edge must rotate much faster to cover that 50 in. in 1.8 seconds than the point near the center, which has to cover less than a fifth of the distance in the same time.

因此，边缘上的点每1.8秒必须比中心的点多转50英寸，使它不得不在同样的时间里覆盖不到五分之一的距离。

youdao

If you do this the inside cover of your paper will be smooth, if you don't there is a chance there will be a line resulting from the edge of the manilla.

如果你做了这一步，封面内侧会比较平整。

youdao

It has struck the deal with On Demand Books, makers of the Espresso book Machine that can print a 300-page book in less than five minutes, complete with a cover and a bound edge.

浓缩咖啡印书机可以在5分钟内印刷出一本300页厚的图书，包括封面和书脊。

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