车轮踏面磨耗导致车轮外形改变，使其滚动圆直径产生偏差，对车辆系统的动力学特性影响较大。
Wheel tread wear leads to change of the wheel profile and rolling diameter, which influences the dynamic behaviors of railway vehicles seriously.
在曲线处的内轨和外轨通常打磨成不对称的形状，目的是改善共形接触，增大内外车轮滚动圆的直径差，利于导向。
Curves generally are ground with asymmetric profiles that promote conformal contact in order to take advantage of the rolling radius difference and enhance steering.
鲁鲁想，既然圆环可以滚动，西瓜也可以滚动，因为它也是圆的。
Lulu thought since the round hoop can roll, the watermelon can roll too, because it was also round.
这一次，该圆从左上方滚向右下方，并在滚动的过程中不断变大。
This time the circle slides in from the top left to the bottom right, and grows as its does so.
圆的东西容易滚动。
当一个圆沿着一条直线滚动时，圆边上一点的轨迹叫做旋轮线或摆线。
When a round object rolls along a straight line, a track on the round edge is called a roulette or a cycloid.
当凸轮机构主要用于传递运动时，基圆半径的选择可使滚子做连续滚动为优先考虑条件。
When the CAM is chiefly transferred movement, the choice of radius of base circle firstly is considered the roller's continuous rolling.
本文讨论了在外圆磨床上进行切入式磨削时，各种切削液对滚动轴承铜磨削表面质量的影响。
In this paper, the effects of grinding fluids are discussed experimentally on ground surface quality of the roller bearing steel GCr15.
它现在是一个完美的圆，因此能够快速地滚动，快到无法再欣赏美丽的花儿，不能与虫儿聊天了。
Now that it was a perfect circle, it could roll very fast, too fast to notice the flowers or talking to the worms.
西瓜也是圆的，不也可以滚动吗？想到这儿啊，小猪噜噜顾不上休息，把大西瓜放在地上。
He thought, the round hoop can roll, the watermelon round too, then it can roll too.
落入下组圆辊上的达到合格尺寸上限的球型丸，继续在滚动的圆辊上移动。
The ball pills which reach the upper limit of the qualified size and drop on the lower group of cylindrical rolls continuously move on the rolling cylindrical rolls.
落入下组圆辊上的达到合格尺寸上限的球型丸，继续在滚动的圆辊上移动。
The ball pills which reach the upper limit of the qualified size and drop on the lower group of cylindrical rolls continuously move on the rolling cylindrical rolls.
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