替换主充电器单位，或可能是其他单位的电弧电晕。
Replace primary charger unit, or could be arcing of other corona units.
在我的单位内那些过滤器在方式离并且需要被替换，但是这用任何调谐设备是可能的，因此我不为它责备730es。
The filters in my unit are way off and need to be replaced, but this is possible with any tuner, so I don't blame the 730es for it.
在建立数学模型的基础上，分析了系统长期单位时间内的期望费用，并讨论了最优年龄替换决策。
The expected cost per unit -time for infinite time span is analyzed strictly under the mathematical model constructed, and the optimum age replacement decision is also discussed.
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