How many lines — first of all, where has the melody gone — the theme?
有多少条旋律线，首先，这段旋律去了哪里？
A theme is a melody there have been at least two non-overlapping pieces of music.
一个旋律的主题是一段至少出现过两次的不重叠音乐片段。
A theme is a melody there have been at least two non-overlapping pieces of music.
一个旋律的主题是一段至少出现过两次的不重叠音乐片段。
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