object lesson

noun
🔊/ˈɒbdʒɪkt lesn/, 🔊/ˈɒbdʒekt lesn/
🔊/ˈɑːbdʒɪkt lesn/, 🔊/ˈɑːbdʒekt lesn/
[usually singular]
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  1. a practical example of what you should or should not do in a particular situation借鉴;经验教训
    • Her calm handling of the emergency was an object lesson to us all.她对紧急情况的冷静处理是我们所有人的目标课。