主要诱因是长期受摩擦, 鞋不合脚和足畸形等.
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Neglecting friction and air resistance, the pendulum's mechanical energy is constant.
忽略支点的摩擦和空气对摆的阻力, 摆的机械能为恒量.
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In designing a machine it is necessary to reduce friction as much as possible.
在设计一种机器时,必须尽可能减低摩擦.
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In order to completely overcome the friction, the backward hot extrusion is used.
为了克服摩擦, 使用了反向热挤压.
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Friction usually results in unwanted heat that flows into the atmosphere and is wasted.
摩擦导致产生不必要的热,这些热散失在大气中浪费掉了.
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其大规模减少的笼子里削减滚子轴承,能量吸收和防止摩擦.
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In most machines friction consumes effort, with the result that less work is got out than is put in.
在大多数机器中,摩擦要消耗功, 以致造成输出的功要小于输入的功.
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分娩时往往使疣体摩擦撕裂出血, 由于其组织脆弱, 会给缝扎止血带来困难.
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At the beginning of this thesis, there is a detailed introduction to friction model.
本论文首先详细介绍了摩擦现象的数学模型.
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