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单语范例（未经PONS编辑处理）
Throughout its history, the "liuqin" came in variations ranging from two (which only had one and a half octaves) to four strings.
en.wikipedia.org The doubling of an octave is the number of individual voices on each pitch within the chord.
en.wikipedia.org Each string sound is pitched one octave apart.
en.wikipedia.org It lacks tonal center or drive because the diminished fifth symmetrically divides the octave.
en.wikipedia.org To have the same number of so-called octaves as a conventional piano, a piano for 16ths of a tone would need 704 keys.
en.wikipedia.org