For tapered roller large end and sliding friction between the inner wall, the speed limit is often lower than the same size cylindrical roller bearings.

因圆锥滚子大端与内圈挡边之间滑动摩擦，其极限转速往往低于同尺寸的圆柱滚子轴承。

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Teflon Piston-ring integrated with piston, not only reduce the friction and noise, but also avoid inner-leakage.

特氟龙材料的活塞环与活塞熔接成一体不仅减磨效果好，同时能减少噪音防止内泄。

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The difference between inner friction angel of sandy soil and natural slope angel of sandy soil is also put forward in this paper.

本文论述砂土内摩擦角的测定方法，及砂土内摩擦角与砂土天然坡角的区别。

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But as inner cities gentrify, the poor are being displaced, and it has created real friction in San Francisco and Washington.

CNN: The flip side of sprawl