something that is always ready for use, especially if a regular one fails(尤指爲應對出現問題或故障時的)備用設備,備用品,替代物
Board games are a good standby to keep the children amused if the weather is bad.天氣不好時,棋類遊戲是個不錯的哄孩子們開心的備用選擇。
There are standby generators but these usually only have to work for a few hours a year during power cuts.有備用發電機,不過通常一年只在斷電時使用幾個小時。
on standby When a person or a thing is on standby, they are ready to be used if necessary.待命;備用;随時準備
Hospitals are on standby ready to deal with casualties from the crash.醫院随時準備着接納撞車事故的傷者。