a formal dance的用法和样例：
- Imagine anyone coming to a formal dance in jeans. Of all the nerve!
- Imagine anyone coming to a formal dance in jeans.Of all the nerve!
- A formal dance held for a high-school or college class typically at or near the end of the academic year.
- A ball Victor is a formal dance; a Black and White ball means you can only wear black or white.
- The school is thinking of offering a formal dance class to interested students.