Based on L-M algorithm of BP artificial neural network, the fractal parametric prediction model of running in and wear was established.

基于BP人工神经网络的L M算法，建立了磨合磨损的分形参数预测模型。

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Let the model be used in the pin-disc running in and wear test, an accurate prediction was carried out upon the optimum fractal dimension.

将该模型用于销盘磨合磨损试验，对最佳分形维数进行了准确预测。

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It's best to avoid running in the dark but, if you have to run at night, wear reflective gear and light-colored clothing.Dress in bright colors if you're running in the snow.

最好不要在晚上跑步，但是如果非要在夜里跑步的话，穿上浅色的衣物和反光的装备，雪地里跑步时穿亮色的衣物。

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The general rule of thumb is that running backs experience a decline in productivity around the age of 30 due to the wear and tear they undergo.

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Conventional wisdom holds that the pounding from years of running leads to excessive wear and tear on the body as we age, resulting in joint injuries, knee replacements or arthritis.

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