在印钞行业中，多年来一直未解决钞票纸上水印标记在线实时检测的可靠性和稳定性。
In industry of bank paper , the reliability and stability can not be achieved on on-line real time monitoring of the watermark all the time .
一美元钞票所用的纸也并不值整整一个美元。
The paper in a dollar bill may not be worth a full dollar .
钞票纸