当轮胎逐渐磨损、钢丝层渐渐疲劳、胎面老化之时，它的性能也必然减弱。

When the tyre wear, wire layer gradually fatigue and tread aging, it will weaken the performance.

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结晶质聚合物通常多能抵御有机溶剂并具有良好的抗疲劳和磨损特性。

Crystalline polymers usually are more resistant to organic solvents and have good fatigue and wear-resistant properties.

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模具主要是依靠其表面进行工作，因此，模具的失效80%以上来自表面损伤，如磨损、疲劳、腐蚀等。

Molds rely mainly on their surface to work, therefore, more than 80% of failures is due from surface damage, such as wear, fatigue, and corrosion.

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