Using the property of Markov at the points of replacement period, a model of determining 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。

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The University of Leeds research team has, for the first time, shown that leg muscle dysfunction is related to the severity of symptoms in heart failure patients.

英国利兹大学的研究团队首次发现腿部肌肉功能障碍与心脏衰竭患者病症严重程度之间的相关关系。

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You're going to manage to make it roll for a certain amount of time, but at the first sign of failure, they'll cut you right off.

在一定的时间后你能让它‘过去’，但是首先出现的即是失败的讯号，他们会瞬间切断你的事业线。

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Former President Bill Clinton, for example, told audiences that the reason Democrats faired so poorly in the 1994 off-year elections, when Republicans took over the House and Senate for the first time in 40 years, was his failure to pass ClintonCare.

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Mercedes' Nico Rosberg, who set the fastest time in first and second qualifying sessions, retired on lap 27 due to an electrical failure, while Sauber driver Nico Hulkenberg did not even start the race due to a fuel-system problem.

NPR: Lotus' Raikkonen Wins F1's Australian GP

Suharto's failure to act as he promised Hanke is not the first time politicians have violated campaign promises.

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