许多这样的数据库系统都是又大又复杂——试想一下要容纳用图片提供正确驾车路线所需要的全部地图信息！

Many of these database systems are large and complex — imagine holding all the map information needed to provide accurate driving directions with pictures!

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这份地图所使用的符号全部列在索引中。

A list of symbols used on the map is given in the index.

《牛津词典》

这些地图和网格的名称全部被这个异步服务框架本身使用，不需要更改。

The names of the maps and grids are all used by the asynchronous service framework itself and have no need to change.

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