The material embrittlement and residual stress leads to the final brittle fracture of the ball roller.

材料的脆化及较大的应力导致压球辊最终的脆性断裂。

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Like self-aligning ball bearings and spherical roller bearings, they are provided with a spherical outer-ring raceway.

像自调心球轴承和球面滚子轴承，他们提供了一个球形外圈滚道。

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A constant misalignment within the permissible limits does not adversely affect the grease life in spherical roller bearings, self-aligning ball bearings or toroidal roller bearings.

对球面滚子轴承、自调心球轴承或圆环滚子轴承而言，在允许范围内持续的不对中，不会对润滑脂的寿命产生负面的影响。

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If you give up on tablet writing, you can replace the tip to convert the pen to an old-fashioned roller ball.

WSJ: Putting Pen to Tablet: Using a Stylus With an iPad or iPhone

But if the friction created by those connections was greater than the friction between the tabletop and the roller ball, the mouse would skip.

NEWYORKER: Creation Myth

As he was saying goodbye, Derga gave the president a pen, a cheap roller ball he had used to write letter to his son in Iraq.

NPR: Behind Bush's Veto: A Father's Loss, a Humble Pen