What they actually measure is changes in the ratio of O2 to N2, because nitrogen gas levels stay pretty constant.

他们实际测量的是 O2 与 N2 之比的变化，因为氮气含量保持相当恒定。

The fact is called to notice that a fall in the rate of interest is favourable to investment. Ergo, a fall in the ratio of the price of consumers' goods to the price of producer's goods is favourable to investment.

需要注意的是，利率下降有利于投资。因此，消费品价格与生产资料价格之比下降有利于投资。