The value obtained by ratioing the difference between the nitrogen and gas signal with the gas signal is related to the CO gas concentration. 测量值的获得是通过比例差异,氮和气体信号与CO气体含量相关的气体信号之间比例差异而得的。
这好象只是一个短语,obtained by ratioing the difference between the nitrogen and gas signal是解释The value是如何得到的, with the gas signal is related to the CO gas concentration是用来补充前面的“gas signal”的,此值(测量值)是由氮气和气体信号之间比例的差异获得的,此气体信号与CO气体的浓度有关