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.