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平均无故障时间
avia.	mean cycle between failures
busin.	mean-free error time
econ.	the mean error-free time; mean time to failure
el.	mean time between failure
IT	mean free error time
met.	mean-time-to-failure
mil., air.def.	meantime-to-Failure
tech.	mean time between failures
wind.	mean free error
平均无故障失效 前时间
IT	mean time to failure
平均无故障失效前时间
IT	mean time to failure

平均无故障时间: 12 phrases in 6 subjects

Air defense	1
Electric machinery	2
Electronics	5
Hydroelectric power stations	1
Rail transport	1
Space	2