So it looked like you were doing some 70s disco dance.

所起来你在 70 年代的迪斯科舞。

A ball is usually a party where everyone wears very nice clothes and does some sort of formal dancing – not like disco dancing or the kind of dancing you would see in dance clubs, but more formal dances.

舞会通常一个派对，每个人都穿着非常漂亮的衣，种正式的舞蹈——不像迪斯科舞或你会在舞蹈俱乐部到的那种舞蹈，而更正式的舞蹈。