To expand one's horizons means to broaden one's knowledge, understanding, or experience of the world. This expression is often used to encourage someone to try new things, learn about different cultures, or explore new ideas.

For example, you could say:

"Traveling to new places can help expand your horizons and give you a new perspective on life."

"Reading books from different genres can help expand your horizons and broaden your understanding of the world."

Here are some possible Chinese translations of this expression:

拓宽眼界

开阔视野

拓展视野

It is not clear where this expression originated, but it is often used in both spoken and written English.