“大开眼界”，汉语成语，意思是指开阔视野，增长知识。可以翻译为“greatly widen one's horizon，open someone's eyes或broaden one's mind”。

例句：

这场演出真叫人大开眼界。

The performance is a real eye-opener.

巴黎的服装广告使他大开眼界。

The advertisements of costume in Paris broadened his outlook.