1. A system configuration that excludes standby equipment. 一种没有备用设备的方案配置。
2. If the electricity fails, the hospital has a standby power apparatus. 如果停电，这家医院有一套备用的发电设备。
3. Traffic wardens blocked off the road to normal vehicles; a police car and an ambulance were on standby. It was exam day. 交通管理员封锁了这条路，不让普通车辆进来。一辆警车和救护车在一旁待命。因为那天考试。
英英解释
n.
1. something that can be relied on when needed
2. an actor able to replace a regular performer when required adj.
1. ready for emergency use
