虽然现在中心已经有了电子地图，但调度员仍然要走在街道上手工绘制地图。

Although nowadays the center has electronic maps, the dispatchers still walk through the streets to draw maps by hand.

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这可能是最需要精细操作的步骤了，因为我们不得不将缺失的房子手工绘制出来。

This is probably the most delicate step because we have to hand paint the missing part of the house.

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印刷术发明以前，类似托勒密所制的地图很少见，而且价格不菲，因为当时的地图必须以手工绘制。

Before the invention of printing, maps like Ptolemy's were rare and expensive because they had to be hand drawn.

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