1、In music theory, a tetrachord is a series of four notes that span a perfect fourth.
音乐理论中,四音音阶是指跨越纯四度的四个音符的系列。
2、The ancient Greeks used tetrachords as the foundation for their musical scales.
古希腊人将四音音阶作为他们音乐音阶的基础。
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