其次，他们必须制作一张可靠的关于它表面的地图。
Secondly they will have to make a reliable map of its surface.
为什么强大：它运用全球定位系统生成一张你附近的房地产销售和开盘地图，你可以根据住房距离，房子大小，价格范围对结果进行优化等等。
Why it's great: it USES GPS to produce a map of properties for sale and open houses near your current location, which you can refine according to distance, size of house, price range, and more.
地图总是绘制很漂亮，饰以圣人、龙和扇着微风的小天使；无论是水手和商人，还是旅者和将军，几乎都离不开它，不过没有一张地图是完美无暇的。
The maps were often beautiful, adorned with saints, dragons and wind-puffing cherubs, and nearly always useful, to sailors, merchants, travellers and generals, but none was perfect.
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