To broaden one's horizons; to see something eye-opening.
开阔视野，增回见识。
唐·李瀎《松窗杂录·楚几》光业马上取笔答之，曰‘大开眼界莫言冤。’”
Traveling to different countries really opened my eyes.
Learn the next connected idiom: 大开眼界 (dà kāi yǎn jiè) → 解放思想 (jiě fàng sī xiǎng)
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