"七弦"是个多义词，它可以指七弦（字词）,七弦（大乔小乔演唱歌曲）。
七弦琴有一根特低弦，在标准调弦里是B音。
Seven-string guitars have an extra low string which is a B in standard tuning.
希腊莱斯·沃斯岛的古典艺术木纹，成就了欧洲文明艺术的七弦古琴。
Classical art wood texture of Lesvos Island in Greece achieved the seven-stringed plucked instrument of European civilization art.
周武王增加了第七根弦，以鼓励他的军队与商朝作战。
King Wu of Zhou, added a seventh string to encourage his army to fight with the Shang.
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