circumference
复数形式:circumferences
in two dimensions,
两维体系中
the length of the circumference is proportional to the radius. Right?
与半径成正比 对吧
one of these saw blades and it's spinning.
一个刀片在旋转
you remember long back we learned,
记得我们很早之前学过
the circumference through which all these lines of force pass,
场力线通过的圆周长度
So if you go out twice as far there's twice the circumference.
当距离变为原来的两倍 周长也变两倍
and made an impression.
留下一个痕迹
That's when it rolls without slipping.
这个例子就是无滑动地滚动的情况
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