平均无故障时间

例句：

1. 1. The average time between failures is 500 hours.
   平均故障间隔时间为500小时。
2. 2.The manufacturer guarantees a mean time between failures of at least 10,000 hours.
   制造商保证平均无故障时间至少为10,000小时。
3. 3. The engineer calculated the mean time between failures for the new system.
   工程师计算了新系统的平均无故障时间。