As this usually repeats in regular cycles, there is a fixed ratio between the number of P waves and the number of QRS complexes per cycle.

由于它以规则周期重复，因此，每个周期P波和QRS波群数量之间有一个固定的比率。

When, for example, Congress in 1792 fixed the ratio of the two metals at one to fifteen—one ounce of gold declared worth fifteen of silver—it was soon found that gold had been undervalued.

例如，当国会在 1792 年将两种金属的比例固定为 1 比 15 时——一盎司黄金价值 15 银——很快人们就发现黄金被低估了。