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for a rainy day 以防不时之需（成语）
英文释义
For a future period of unexpected financial need; for a time when a person has less money that required.
例句
My parents taught me to save some money for a rainy day, so if I lose my job, I can survive for a while until I find a new one.
父母教导我，要存些钱以防不时不需，所以如果我失业了，我有能力维持生活，直到找到新工作。
