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

所以看在跳 70 年代迪斯科舞。

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服，跳某种正式舞蹈——不像迪斯科舞或会在舞蹈俱乐部看到那种舞蹈，而更正式舞蹈。