to make someone understand more and know more about different subjects, ideas, places, etc.

They say that travel broadens the mind. 他们说旅行拓展思维。

The Internet can give children opportunities to broaden their minds. 互联网给儿童带来机会让他们拓展视野。

Do you suppose the trip broadened his mind in any way?

The vital thing about reading is that it broadens the mind.

I hoped that all these new experiences might broaden her mind.

See also: broaden (MORE GENERAL)