大開眼界

大开眼界
dàkāiyǎnjiè
(idiom) to broaden one's horizons greatly

CEDICT

eye-opening; able to broaden one's horizon

Wiktionary

增加見識，開闊視野。

重編國語辭典

讓視野開展，見聞增加

維基詞典

Entry Composition

1 大開 dàkāi to open wide
2 眼界 yǎnjiè (lit. and fig.) field of vision; scope; horizon