The horizontal axis of this chart is a timeline and vertical areas in the timeline represent releases and each card posted to the areas represents one feature that will be implemented in the release.
表的横轴代表时间线，线上的竖直区域代表发布，在区域中的卡片各自代表一项该次发布中要实现的特性。
3
According to Nilson Report, a trade magazine, American merchants shelled out $56 billion in payment-card fees last year (see chart), over twice the amount they paid five years earlier.