舞厅里充满了优雅，舞者们随着恰空舞曲的节奏翩翩起舞。

The ballroom was filled with grace as the dancers moved to the rhythm of a ___chaconne.

这首恰空舞曲以一个循环的和弦进行为基础，发展出了丰富的变奏。

The ___chaconne builds upon a repeating chord progression, unfolding with elaborate variations.