cadence

The plagal cadence, sometimes known as the Amen cadence from ecclesiastical use, is the progression from the chord of the subdominant to the tonic, IV - I.

变格终止，有时也被称为源于教会的“阿们终止”，是指从下属音和弦到主音和弦的进行，IV–I。

S4.The fourth heart sound (S4, atrial gallop, presystolic gallop) is also the result of altered ventricular compliance.Its cadence has been likened to the soft a of appendix.

S4第四心音，又叫马律，收缩期前马律，也是心室顺应改变的结果。