定位数据的应用、UOW和活动ID。
索引是用来定位数据页的顺序指针或键的集合。
Indexes are collections of sequentially ordered Pointers or keys used for locating data pages.
他们可以利用GPS定位数据协同工作，策划出最有效的清理方案。
They coordinate with each other by using GPS location data. That lets them plot out the most efficient way to tackle a clean-up project.
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