By improving steel material quality, adopting plastic cage, improving rib structure and using crowned rollers, the life and performance of cylindrical roller bearing can be largely increased.

经改善钢材质量、采用塑料保持架、改进挡边结构及凸度滚子的应用，可使圆柱滚子轴承的寿命和性能大幅度提高。

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Using surface coating of healants, the surfaces of the corroded, impact-crushed and cavitation-eroded equipments were repaired and protected, and the useful life of the equipments can be increased.

通过表面粘涂，对受到腐蚀、冲蚀、气蚀的设备进行表面修补与防护，可提高设备的使用寿命。

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Aerobic exercise, a method of conditioning the cardiorespiratory system by using a variety of activities that create an increased demand of oxygen over an extended period of life.

如何提高心肺功能通过有氧运动。有氧运动指由于人体在一段持续时间内进行的身体活动而使身体对氧气需求量增加的一种状态。

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