After the seal handle is released, the pressure spring will reset and the driving counting ring driven by the driving board will rotate further.
松开印把时，压力弹簧复位，驱动板再次通过驱动滑槽推动主动记数环继续转动。
When the seal handle is pressed down, the pressure spring will be compressed, and the driving counting ring will be driven to rotate by the driving board.
压下印把时，压力弹簧被压缩，驱动板通过主动记数环上的驱动滑槽推动主动记数环转动。
The method of counting for circular ring objects in frequency domain is proposed.
研究了用频域法实现圆环形目标物计数的方法。
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