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and a hydraulus (water organ), in which the weight of water forced air through the organ pipes. 另一項(xiàng)著名的發(fā)明是一種水風(fēng)琴，靠水的重量代替下落的鉛砝碼，以推動(dòng)空氣通過(guò)風(fēng)琴管。