eye-opener

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++ˈeye-ˌopener noun [countable usually singular]  SURPRISEDan experience from which you learn something surprising or new 使人大开眼界的经历 The whole trip has been a real eye-opener. 整个旅行真让人大开眼界。

Examples from the Corpus

eye-opener• It had been my first alpine climb, and it had been an eye-opener.• A visit to a farm is an eye-opener to a city child.• I never put that much stock in images, and to have him do that-that was just an eye-opener.• It was an eye-opener, and it was puzzling.• It is not readily apparent that Edinburgh is a busy seaport but a visit to Leith Docks can be a fascinating eye-opener.• This can be a real eye-opener in many parts of the world.• Jimmy thought her a real eye-opener.

ˈeye-ˌopener nounChineseSyllable  

an something which from experience you learn Corpus

eye-opener
ˈeye-ˌopener noun [countable usually singular]
an experience from which you learn something surprising or new:
    The whole trip has been a real eye-opener.

eye-openerBrE /ˈaɪ əʊpnə(r)/ 🔊NAmE /ˈaɪ oʊpnər/ 🔊 noun [usually singular] an event, experience, etc. that is surprising and shows you sth 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。🔊🔊