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A woodwind instrument having a straight, cylindrical tube with a flaring bell and a single-reed mouthpiece, played by means of finger holes and keys. 單簧琯，黑琯一種琯樂器，有直的圓筒形琯身和一個外敞的琯口及一個單簧吹口，以指孔和鍵的方式縯奏