[计] 备用设备, 准备, 备用
[化] 备用的; 储备的; 辅助的

n. One who, or that which, stands by one in need; something
upon which one relies for constant use or in an emergency.

词型变化：名词复数形式 : stand-bys

standby的用法和样例：

例句

用作名词(n.)

Powdered milk is a good standby in an emergency.奶粉是应急时很好的备用品。
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。
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。

用作形容词(adj.)

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。
Your reservation is already in the standby list.您的订位已经在候补名单了里。

词汇搭配

on standby严阵以待
standby redundancy待机准备,备份冗余,...
standby buffer备用缓冲器
standby application待用,备份应用...
standby facility备用设备,备用贷款...
standby battery备用电池组,备用蓄电...
standby mode备用方式
standby period等待期间, 准备期...
standby pump备用泵
standby circuit后备电路
standby power储用功率
warm standby热备份
standby compass应急罗盘
block standby备用数据块
stand by袖手旁观

【近义词】

fallback撤退
reserve保留
replacement更换
resource资源
stand-in替身
backup后备
substitute代用品
spare备用的
emergency突发事件
unreserved坦率的
last-minute最后一刻的
late迟的
understudy充当（某角色的）候补演员...

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