Root motion is the movement from one chord's root to another chord's root.
（一个和弦的根音移动到另一个和弦的根音就叫根音运动）To demonstrate root motion, we will use a I and a vi chord in C Major.
（我们用I和vi来演示一下C大调的根音运动）The root of the I chord (a C major triad) is C.
（I（C的大三和弦）的根音是C）The root of the vi chord (an A minor triad) is A.
（vi（A的小三和弦）的根音是A）Therefore, the root motion between I and vi (C to A) is down a third.
（所以，根音在I和vi（C和A）之间向下运动了三度）Let's try another example: a IV chord going to V.
（我们再用IV到V演示一下）The root of the first chord (an F major triad) is F.
（第一个和弦（F的大三和弦）的根音是F）The root of the second chord (a G major triad) is G.
（第二个和弦（G的大三和弦）的根音是G）The root motion of these two chords is down a fourth or up a fifth.
（根音向下运动了四度或向上运动了五度）Both I→IV and ii→V are circle progressions.
（I→IV和ii→V都是循环进行）iii→vi and IV→viio are also circle progressions.
（iii→vi和IV→viio也是循环进行）Next, we will work out all possible circle progressions for a minor scale.
（接下来我们把一个小调中所有可能的循环进行都列出来）This chart displays the circle progressions for both major and minor scales.
（这张表是大调和小调中的循环进行）
