本教程还假设您了解地图的一些关键特性：距离、坐标和比例尺。
The tutorial also assumes you know some key features of a map: distance, coordinates, and scale.
他们说，部分工具尚在开发中；其他的将会在已有的产品，像搜索、电子邮件、地图、照片、视频以及广告等上面添加特性。
Some of the tools are still being developed, they said; others will add features to existing products, like search, E-mail, maps, photos, video and ads.
犯罪地图和其它线上工具的交互式特性，可能由于不完全或不精确的犯罪报告，而妨碍它们的有效性。
The interactive capability of crime maps and other online tools can hinder their effectiveness, due to incomplete or inaccurate crime reporting.
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