rainy day -用法

rainy day

a time of need，esp．a time when money may be needed困难的时候，尤指缺钱的时候

I don't spend my whole salary．I put some in the bank for a rainy day．我不花光全部工资，在银行里存些钱以备不时之需。

Each week he saved a little money for a rainy day．每周他节省点钱以备急用。