在构建混合的plot - latlong和Perl - GD地图后，我们将修改背景地图轮廓。
After building the hybrid plot-latlong and Perl-GD maps, we'll modify the background map Outlines.
通过使用背景地图文件，可大大简化绘图程序，并实现将高分辨率的地理信息添加到分析图中。
The drawing program has simplified and the detail geographic information has appended by using the map background file.
一项最新民调发现，在经济和人口结构发生巨变的背景下，美国的年轻一代正在绘制一幅21世纪通向成功的地图。
Against a backdrop of drastic changes in economy and population structure, younger Americans are drawing a new 21st-century road map to success, a latest poll has found.
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