burn fingers
意外或失败的经验使某人非常了解某个行为或决策的风险或危险
口语·形容因冒险或无知而吃亏
英文释义
to suffer negative consequences or get hurt by one's own actions or decisions
例句
Investing without research can burn fingers, as many beginners learn the hard way.
典故来源
源自被火烫伤的实际经历，比喻因无知或冒险而遭受损失或教训。