They were forced to withdraw. The Confederates moved slowly, then more quickly as Union troops chased them.

VOA: special.2009.12.17

So here's what we find, and as you can see there -is this bass rhythm moving slowly or quickly?

那么,大家能看到,这个低音节奏是缓慢还是迅速

耶鲁公开课 - 聆听音乐课程节选