Pitchers were forbidden to give the ball an artificial spin or trajectory by, for instance, nicking it or spitting on it and from discolouring the ball with dirt or tobacco juice or hair grease.
投手则被禁止发人为旋转或轨线的球，例如给球切口或在球上戳刺，也禁止投手用污垢、烟草汁、头油让球变色。
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。
Self-aligning ball bearings of the mean diameter range are also available with seals (Figure 1.6) and a for-life grease fill.
平均直径变动的调心球承也可带密封（图1.6）和一个终身油脂填充。
The self - repair performance of micron copper in grease is evaluated with four - ball tester.
通过四球试验评价了微米铜在润滑脂中的自修复作用。
The self - repair performance of micron copper in grease is evaluated with four - ball tester.
通过四球试验，考察了微米铜粉在润滑脂中的摩擦学行为和抗磨性。
The self - repair performance of micron copper in grease is evaluated with four - ball tester.
通过四球试验，考察了微米铜粉在润滑脂中的摩擦学行为和抗磨性。
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