A form that is an altered version of a given theme, diverging from it by melodic ornamentation and by changes in harmony, rhythm, or key. 變奏曲一種給定主旋律的改編版，通過旋律的修飾和節奏或琴鍵的變化而從中分離出來
The figure formed by two planes diverging from a common line. 平面角從一條公共直線出發的兩個平面形成的圖形
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