The minimal objective function which included system cost, maintenance and repair costs and loss expectation was established.

构建以系统成本造价、维护维修费用和失效损失期望之和为最小的目标函数。

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Improvements in design, materials and manufacturing mean that today's vehicles can be operated safely longer than ever, albeit at the cost of continuous maintenance and repair.

设计、材料和制造工艺的改进，意味着今天的汽车安全行驶寿命比以往任何时期都长——尽管车主必须不断的进行维护和维修。

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Lack of maintenance inevitably leads to something big breaking and that will cost you a lot more to repair than it would have cost to make small, ongoing investments in regular maintenance.

缺乏保养会导致严重的问题发生，这样花在维修上的钱就比花在定期维护上的钱要多得多了。

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We also consulted maintenance and repair-cost predictions from Intellichoice.com to ensure that any of the cars and trucks among our recommendations would not become unduly costly to keep running.

FORBES: Cars That Can Last For 250,000 Miles (Or More)