Your pager will be passed two parameters: start, which will be the numeric index of the first photo to show alphabetically; and step, which will be the number of photos to show.
分页器应该传递两个参数：start是按照字母顺序显示的第一幅照片的索引号，step是显示的照片数。
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You can find all the Mappiness data in aggregate here including a happiness index chart, and a photo-map of the happiest locations in the UK, as well as real-time happiness meters.