可以很方便地利用清单7中展示的explain输出来描述其细节，可以对源表进行顺序扫描，并且在目标表上完成索引查找。
It is easier to describe this in detail using the explain output shown in Listing 7. Sequential scan is done on the source table, and index look-up is done on the target table.
那很方便，和它鼓励您将查找干净代码，从而轻松地做到这一点。
That's convenient, and it encourages you to keep your code looking clean by making it easy to do so.
本系统可以很方便查询出用户所要查找的地图上有的位置，并把它按一定比例放大定位在视图中央。
User can expediently look up his demanding position in the system and orient it in center of view.
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