一种减少磨擦的轴承，主要由包括可自由旋转的硬金属珠的环状轨道构成，转动轴或其他部件因撞碰金属珠而转动。
A friction-reducing bearing consisting essentially of a ring-shaped track containing freely revolving hard metal balls against which a rotating shaft or other part turns.
刀与纸边的磨擦力减少，即减少对机械的磨损，而刀本身的耐用性更强。
On the edge of the paper to reduce friction, that is, reduce mechanical wear and tear, and the durability of the tool itself.
通过上浆给纱线施加了保护层，在织造时减少了对纱线的磨擦和纱线的断头。
These form a protective coating over the yarns and keep them from chafing or breaking during weaving.
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