Definition: ready to be used if or when you need it Level: C1
明智的做法是保留一些应急资金备用。
It's wise to keep some emergency funds ___in ___reserve.
总是备有一个备用选项，以防计划有变。
Always have a backup option ___in ___reserve in case plans change.
医院储备额外的物资，以备危机时使用。
The hospital maintains extra supplies ___in ___reserve for crises.
