eye-opener

noun
🔊/ˈaɪ əʊpənə(r)/
🔊/ˈaɪ əʊəpənər/
[usually singular]
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  1. an event, experience, etc. that is surprising and shows you something that you did not already know使人大开眼界的事情(或经历等)
    • Travelling around India was a real eye-opener for me.周游印度真让我开了眼界。🔊🔊