他刚进入一首曲子，小提琴的一根弦就断了。
As he got into the piece one of the strings of his violin broke.
触动心中一根弦，突然怀念的感觉席卷全身。
Touch a string in the heart, suddenly the feeling of nostalgia swept through the whole body.
其实自己真正想拔通的只是自己心底的一根弦。
In fact, what they really want to pull out is just a string of their own bottom of my heart.
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