standbys

n.

待命（状态）( standby的名词复数 )；备用的人或物；随时准备行动；等退票（或余票）

1. Powdered milk is a good standby in an emergency.
   奶粉是应急时很好的备用品。
2. The emergency services were put on standby after a bomb warning.
   接到炸弹警报后，各紧急救助部门进入待命状态。
3. A special team of police were kept on standby during the time of violence.
   在发生暴乱期间，经常有一支警察特别小分队处于整装待命状态。

1. They bought two cheap standby tickets for Rome.
   他们买了两张便宜的去罗马的备用机票。
2. Your reservation is already in the standby list.
   您的订位已经在候补名单了里。

Some theorems on standbys
Reliabilty of a System with Standbys and Spares
N-policy machine repair system with mixed standbys and unreliable server
Reliability‐based measure for a system with standbys subjected to switching failures
A two-unit parallel system supported by ( n -2) standbys with general and non-identical lifetimes
Performance modeling of state dependent system with mixed standbys and two modes of failure
Joint determination of production run length and number of standbys in a deteriorating production process
Transient analysis of machining systems with service interruption, mixed standbys and priority
Performance modelling of the M/G /1 machine repairman problem with cold-, warm- and hot-standbys
Transient Analysis of M/M/R Machining System with Mixed Standbys, Switching Failures, Balking, Reneging and Additional Removable Rep...