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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. 压力记录器，记波器一种记录压力(如血压)或张力(如肌肉张力)变化的仪器，它通过一支笔或记录针的方式描出旋转的轨迹