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An instrument for recording variations in pressure, as of the blood, or in tension, as of a muscle, by means of a pen or stylus that marks a rotating drum. 壓力記錄器，記波器一種記錄壓力(如血壓)或張力(如肌肉張力)變化的儀器，它通過一支筆或記錄針的方式描出旋轉(zhuǎn)的軌跡