如果平均失效间隔时间（MTBF，mean time between failure）或平均 失效前时间（MTTF，mean time to fail）远大于平均修复时间（MTTR，mean time to repair）或者 平均恢复时间（MTTR，...
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27 非参数估计下平均无故障工作时间（ Mean Time To Fail， MTTF）及方差的表 达式如式 (3-30)和式 (3-31)。
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MTTF- Mean Time To Fail 次出现故障以后还应问及到平均无故障时间
mean time to fail
平均失败时间
以上为机器翻译结果，长、整句建议使用 人工翻译 。
On the other hand, young couples fail to spend time with their old parents, and some of them are even too mean to provide the old with at least a decent living environment.
另一方面，年轻夫妇们没能花时间和他们的老父母们在一起，有一些人甚至吝啬得不肯给父母提供像样的居住环境。
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By fail, we mean cut and run before giving Iraqis the time and support to establish a stable, democratic government that can stand on its own.
CENTERFORSECURITYPOLICY: What if we lose?
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