For ball mill this special equipment, its life cycle is long, some can even for 10 years.
对于球磨机这种特殊设备，其生命周期很长，有些甚至可以达10年之久。
It's the most important aspect, and the part on which the whole cycle rests... just imagine that the hips are a bouncing ball that to give weight and rhythm to the cycle.
这是最重要的一环，是整个运动都要依赖的一分，只需要把胯想象成一个跳跃的球，它将带给整个循环以重量和节奏。
Single row angular contact ball bearing with two piece inner ring has complex construction, long design cycle, great difficulty in processing.
双半内圈四点接触球轴承结构复杂、设计周期长、加工难度大。
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