what you must know in order to determine the reference of an expression
in tension的用法和样例:
例句
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