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1. Thefriction between the two surfaces is what causesthe wear and tear on the material.
两个表面之间的摩擦是导致材料磨损的原因。
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2. Thefrictional force between the moving parts ofa machine can affect its efficiency.
机器移动部件之间的摩擦力会影响其效率。
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3. The frictional forces in the fluid are responsible forthe drag on the moving object.
流体中的摩擦力对移动物体的阻力负责。