An instrument for counting the number of blood cells in a measured volume of blood. 血细胞计数器一种仪器，用于计算一定量血液里所含血细胞的数量
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
A small wind instrument for making whistling sounds by means of the breath. 口哨; 哨子一种很小的吹奏乐器，通过呼吸而发出哨声
An early instrument for measuring altitude of celestial bodies, consisting of a90= graduated arc with a movable radius for measuring angles. 象限仪用来测量天体纬度的一种早期工具，由一个有90度刻度的圆弧和一个用来测量角度的可移动的半径构成
