第二，因为只有雄鹿会做出摩擦动作，摩擦动作和与之相关的化学物质表明了制造擦痕的鹿的性别。
Second, because only male deer rub, the buck rub and its associated chemicals indicate the sex of the deer producing the rub.
雄鹿摩擦都有一种由雄鹿前额上的腺体产生的气味，这种气味在制造擦痕时就涂抹到了树上。
Buck rubs also have a scent produced by glands in the foreheads of deer that is transferred to the tree when the rub is made.
轮胎是由天然橡胶与合成橡胶制成的混合物，从而具有汽车制造商所要求的摩擦力和耐用性。
Tyres are made of a combination of natural and synthetic rubber to provide the grip and endurance required by carmakers.
客户的卷芯如果是特殊材料制造的，可采用摩擦系数较小的瓦片材料。
If the roll core is made of special materials, smaller friction coefficient of tile can be used.
本文介绍了这种衬套的结构特点、材质分析、制造工艺和摩擦系数测量及规定寿命试验的试验过程。
Structural features, material analysis, manufacturing process, friction coefficient measurement and rated life test of the bushing are discussed.
它们摩擦力低，可以制造出精确度高，满足安静运行要求的各种类型。
They have low friction and can be produced with high precision and in quiet running variants.
人工膝关节生物摩擦学模拟试验是在设计和制造阶段评价人工膝关节假体的主要方法。
This paper reviews recent advances in the artificial knee joint simulation test bench and the corresponding bio-tribological tests.
人工膝关节生物摩擦学模拟试验是在设计和制造阶段评价人工膝关节假体的主要方法。
This paper reviews recent advances in the artificial knee joint simulation test bench and the corresponding bio-tribological tests.
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