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qin (7-stringed Chinese zither); guqin
「琴」 has another reading with different meanings.
琴を弾く姿がとても優雅だった。
The figure playing the koto was very elegant.
祖母は昔、琴の先生をしていた。
My grandmother used to be a koto teacher.
彼女は琴の演奏で賞をもらった。
She received an award for her koto performance.