Since performance will degrade over time, this means that the designer must carefully consider how long the component is expected to last, and how many cycles the contact is expected to see.

由于性能会随着时间而退化，这就意味着设计者必须认真考虑元件的期望使用时间以及期望的接触循环数。

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Then we proposed a stochastic expected value model to improve the on-line performance of timetable and reduce total travel time on the basis of considering interactions among various slack times.

首先，给出了冗余时间的含义与分类，探讨了冗余时间对列车运行图动态性能的影响过程，并分析了多种冗余时间之间的关系。

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Then we proposed a stochastic expected value model to improve the on-line performance of timetable and reduce total travel time on the basis of considering interactions among various slack times.

首先，给出了冗余时间的含义与分类，探讨了冗余时间对列车运行图动态性能的影响过程，并分析了多种冗余时间之间的关系。

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