没有摩擦力，皮带就不能将动力从一台机器传送到另一台机器。
In the absence of friction, belts would not be capable of conveying power from one machine to another.
随着弹簧规模的援助(见上文)近似一条皮带和一个特定的表面之间的摩擦系数，可以很容易被发现。
With the aid of a spring scale (see above) the approximative coefficient of friction between a belt and a specific surface can easy be detected.
没有摩擦力，皮带传动的机器就无法使用。
In the absence of friction belted machinery would not be used.
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