You can think of velocity as the rateof change in the progress curve, or the rateof growth or shrinkage of the Backlog.
您可以把速度理解为这个过程曲线的变化速率，或者是待完成工作增长或者收缩的速率。
2
Learning curve theory states that as the quantity of items produced doubles, costs decrease at a predictable rate.
学习曲线理论说随着生产的产品数量翻倍，成本以可估的比率下降。
3
He wrote a key paper with Olivier Blanchard on the "Beveridge curve," which captures relationship between the number of job openings and the unemployment rate.