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- Using the property of Markov at the points of replacement period, a model of de termining the optimal period is developed with objective of maximizing the mean time to first failure of system. 利用在更换周期点上具有的马尔可夫性质，以系统首次故障前平均工作时间最大为目标建立了确定最佳更换周期的模型。
- The individual parameter for evaluating overhauled motor vehicles are: mean time to first failure(MTTF),mean time between failures(MTBF),equivalent failure rate(D),ect. 可靠性单项指标的确定 :平均首次故障里程 (MTTF) ,平均故障间隔里程 (MTBF) ,当量故障率 (D) ;
- Based on the comprehensive evaluation indicator system constructed (Mean Time To First Failure MTTFF; 根据所构建的综合评价指标体系（平均首次故障间隔时间MTTFF；
- 2.reliability indicator includes Mean Time To First Failure (MTTFF) and Mean Time Between Failure (MTBF); 以“在规定的时间间隔内出现的”故障次数来表示的一种故障阀值。
- mean time to first failure 平均首次失效前时间
- The average time from start of use to first failure in a large population of identical systems, components, or devices. Abbreviated MTBF. 大多数相同的系统、组件或者设备的，从开始使用到第一次发生故障以来的平均时间。缩写为MTBF。
- time to first failure 首次换效时间
- My first failure only intensify my desire to succeed. 我的初次失败只更加强了我成功的信念。
- I need some time to orient my thinking. 我需要一些时间来使我的思想适应。
- A transistorize radio takes no time to warm up. 晶体管收音机不需要预热时间。
- Novel flexible message structures to allow reduction in the Time to First Fix (TTFF) and exploitation of satellite path diversity. 采用全新的可变电文结构，能够减少“首次定位时间”（TTFF），并可利用卫星的路径分集。
- It may take a long time to find a solution to the problem. 也许要花很长时间才能找到解决这个问题的办法。
- It took him long time to smooth away perplexities. 他花了好长时间才消除了困惑。
- It is time to pony up on that bill. 是照帐付钱的时候了。
- My explanation took a long time to sink in. 我的解释很久才被人理解。
- He does odd jobs for me from time to time. 他有时给我干点零活。
- We're just in time to catch the train. 我们正好赶上了火车。
- I think the trip may give me time to simmer down. 我以为这次旅行会给我时间冷静下来。
- No significant difference was observed in times to first post-labor bowel movement or episiotomy dehiscence rates. 此外，在产后排便的时间方面，未灌肠的产妇并未延迟其产后排便时间，或增加会阴伤口裂开的机率。
- He does the odd job for me from time to time. 他偶尔来为我做些零碎的工作。
