她穿着漂亮的礼服参加了她的第一场正式舞会。

She wore a beautiful gown to her first ___cotillion.

在18世纪的法国宫廷舞会上，人们常常跳着欢快的科蒂永舞。

At 18th-century French balls, people often danced to the lively ___cotillion.