Suppose you had a disk in your car which had a radius of half a meter.
假设车里有个圆盘，半径为半米。
2
The concentrated copy electric energy meter is to old meters aluminium disk revolution translate into pulse signal, and to pulse count translate into electric vector data for storage.
集抄电能表是通过将原基表的铝盘转数转化成脉冲信号，并将脉冲数转化为电量数据存储。
3
In CCD Auto-guide Unit system of One-meter infrared solar telescope (YNST), the display and update of full-disk solar-image put forward much higher requirement to the real-time capability of display.